Millennials were the largest generation group in the U.S. in 2023, with an estimated population of 72.7 million. Born between 1981 and 1996, Millennials recently surpassed Baby Boomers as the biggest group, and they will continue to be a major part of the population for many years. The rise of Generation Alpha Generation Alpha is the most recent to have been named, and many group members will not be able to remember a time before smartphones and social media. However, the group already makes up around 42.75 percent of the U.S. population, and they are said to be the most racially and ethnically diverse of all the generation groups, with the oldest Generation Alpha members aging into adolescents this year. Boomers vs. Millennials The number of Baby Boomers, whose generation was defined by the boom in births following the Second World War, has fallen by around seven million since 2010. However, they remain the second-largest generation group, and aging Boomers are contributing to steady increases in the median age of the population. Meanwhile, the Millennial generation continues to grow, and one reason for this is the increasing number of young immigrants arriving in the United States.

In 2023, Millennials were the largest generation group in the United States, making up about 21.71 percent of the population. However, Generation Z was not far behind, with Gen Z accounting for around 20.69 percent of the population in that year.

In 2023, there were approximately 14.69 million millennials in the United Kingdom, making it the largest generational cohort at that time. Millennials surpassed the Baby Boomer generation as the largest generation for the first time in 2019. The two youngest generations, Gen Z and Gen Alpha, numbered approximately 13.2 million, and 8.3 million respectively. Gen X are, as of the most recent year, the second-largest generation in the UK at 14.04 million people, with their parent's generation, the Silent Generation, numbering around 4.3 million people in the same year. There were estimated to be 85,920 people who belonged to the Greatest Generation, the parents of the Baby Boomer generation, who lived through major events such as the Great Depression and World War Two. Post-War Baby Boom The baby boomer generation was the largest generation for much of this period due to the spike in births that happened after the Second World War. In 1947 for example, there were over one million live births in the United Kingdom, compared with just 657,038 live births just thirty years later in 1977. Members of this generation are typically the parents of millennials, and were the driving force behind the countercultural movement of the 1960s, due to their large numbers relative to older generations at the time. The next generational cohort after Boomers are Generation X, born between 1965 and 1980. This generation had fewer members than the Boomer generation for most of its existence, and only became larger than it in 2021. Millennials and Gen Z As of 2022, the most common single year of age in the United Kingdom in 2020 was 34, with approximately 944,491 people this age. Furthermore, people aged between 30 and 34 were the most numerous age group in this year, at approximately 4.67 million people. As of 2022, people in this age group were Millennials, the large generation who came of age in the late 1990s and early 2000s. Many members of this generation entered the workforce following the 2008 financial crash, and suffered through high levels of unemployment during the early 2010s. The generation that followed Millennials, Generation Z, have also experienced tough socio-economic conditions recently, with key formative years dominated by the COVID-19 pandemic, climate change, and an increasingly unstable geopolitical situation.

In 2022, 51 percent of Generation Z in the United States were White. In comparison, 48 percent of Gen Alpha were White in that year, making it the first generation that does not have a majority White population in the United States.

In 2023, there were about 72.7 million Millennials estimated to be living in the United States, making them the largest generation group in the country. In comparison, there were 69.31 million Gen Z and 65.35 million Gen X estimated to be in the United States in that year.

As of 2021, Millennials and Baby Boomers made up an equal share of the Australian population at around 21.5 percent each, making them the largest generational groups at the time. Those aged 75 years and over made up the smallest portion of the population, followed by Gen Alpha, or those aged 0 to 9 years at the time.

As of December 2023, Generation X was the most represented group among the generations in Germany, at almost 16.7 million people. The second-largest group, Generation Y, comprised around 16.45 million people.

There were approximately 14.69 million millennials in the United Kingdom in 2023. This generation, sometimes called Generation Y were born between 1981 and 1996 and are mainly the children of the post-war Baby Boomer generation. As of 2023, Millennials were the largest generational cohort in the UK, followed by Generation X at 14.04 million people, Baby Boomers at 13.57 million, and then by Generation Z at 13.2 million. The most numerous single-year of age for Millennials, and the UK as a whole, was 35 at 956,116. Boomerang generation The first cohort of millennials came of age at the turn of the century and have almost certainly been heavily influenced by the growth of internet accessibility during this time. The economic challenges faced by this generation may have a relation to the increasing share of young adults who live with their parents in the UK. This has led to the perhaps unfair, characterization of millennials as the boomerang generation, who failed to grow-up and mature. Some of these negative stereotypes regarding Millennials have since shifted to the next youngest generation, Generation Z, who have started to enter the workplace since the mid-2010s. Generation Remain One of the main challenges that British millennials currently face are their prospects after Brexit. Although the United Kingdom voted to leave the European Union in June 2016, there were clear divisions between regions, classes and age-groups. Most millennials voted to remain in the Brexit referendum with 73 percent of people aged 18 to 24, and 62 percent of those aged 25 to 34 voting to remain. In the next UK election, the majority of 25 to 49-year-olds intend to vote for the Labour Party, with only a slight majority of those over 65 planning to vote for the Conservative Party. Millennials also still appear to oppose Brexit, with approximately 65 percent of 25 to 49-year-olds believing Brexit to have been the wrong decision.

In 2023, the disposable income of a household led by a Millennial in the United States was 97,866 U.S. dollars per year. Households led by someone born in Generation X, however, had a disposable income of around 113,886 U.S. dollars in 2023.

In the Pakistan, the male population aged between 20 to 24 amounted to about 9.74 percent of the total male population in 2023. In contrast, the male population aged between 20 to 24 in Hong Kong amounted to about 4.5 percent of the total male population in 2021. The female Gen Z population in the Asia-Pacific region took up a smaller share among the female population overall compared to their male counterparts.

During a survey conducted in 2024, it was revealed that millennials represented the biggest share of pet owners in the United States (32 percent), followed in second place by Generation X (24 percent). Baby Boomer's came in third, representing some 24 percent of pet owners. Pet ownership in the United States Despite some fluctuations, household penetration rates for pet ownership in the United States have generally increased over the years, going from 56 percent in 1988 to approximately 66 percent in 2023. With millennials constituting the largest group of pet owners in the United States, they also constituted the generational group that planned to spend the most on their pets during the holidays in 2020, with an average spending of 51 U.S. dollars, compared to only 28 U.S. dollars of average planned spending on pets for Baby Boomers. Pet expenditure in the U.S. Pet food and treats constituted the highest selling category for pet products in the United States, with total food and treats sales reaching 58.1 billion U.S. dollars in 2022. Vet care and product sales were the second biggest pet market category that year, generating around 35.9 billion U.S. dollars in sales. Generally, average annual pet expenditure was higher for dog owners than for cat owners across all pet market categories in 2020.

In the first quarter of 2024, 51.8 percent of the total wealth in the United States was owned by members of the baby boomer generation. In comparison, millennials own around 9.4 percent of total wealth in the U.S. In terms of population distribution, there is almost an equal share of millennials and baby boomers in the United States.

As of February 2025, 40 percent of LinkedIn users in the United States were Millennials, whilst 31 percent belonged to Generation Z. Additionally, one in ten U.S. users were Baby boomers.

According to a survey conducted in 2023, 15 percent of Gen Z adults in the United States said that they have attended a rally or demonstration compared to eight percent of Millennials and Gen Xers. Gen Z adults were also the most likely generation to volunteer for a group or a cause, at 30 percent.

A 2023 survey revealed that smartphones were the preferred device for watching video content in the U.S. among 13 to 24-year-olds, with 88 percent using them weekly. In contrast, smart TVs were more popular among viewers aged 35 years and older, indicating a clear generational divide in viewing preferences. As more and more people switch to streaming offers, MVPD set-top boxes have become increasingly unpopular. Generational differences in content choices According to another survey from October 2023, nearly half of Gen Z respondents stated to prefer social video and live streams, compared to one third of millennials. This preference for short-form, interactive content aligns with the high smartphone usage among younger viewers. Meanwhile, millennials are more likely to choose traditional TV shows and movies as their favorite content type, explaining their higher penetration rate of smart TVs and connected devices. Entertainment time The amount of time spent on different video platforms varies significantly by age group. Millennials with young children spend an average of over seven hours per day watching content on connected TV devices, more than double the time spent by other demographics. This trend is further supported by data showing that viewers over 35 dedicate 40 percent of their entertainment screen time to TV, while Gen Z allocates only 17 percent to this medium. Instead, younger viewers spread their time across various platforms, with gaming accounting for the highest share of their entertainment screen time.

According to a global survey conducted in 2021, respondents who belonged to Generation Z reported spending on average three hours per day on social media. Overall, Millennials stated that they spent 2.25 hours per day on online social platforms. Those belonging to the Baby boomer generation spent an average one hour on social media, daily.

In 2023, 9.8 percent of Millennials in the United States stated that they identify as LGBT, while in 2012, less than six percent of respondents from the same generation said the same. Members of Generation Z were the most likely to identify as LGBT, at over 20 percent.

More than half of consumers belonging to Generation Z bought something on social media platforms, according to a survey in 2024. Almost a third of overall consumers bought on social media platforms. The consumer experience In a 2023 survey, Facebook and Instagram were the social media platforms offering the best shopping experience. To gain deeper insights into the elements constituting a satisfactory social commerce shopping journey from the user's viewpoint, key factors shaping consumers' heightened engagement with social commerce included, but were not limited to, deals and discounts, seamless purchasing processes, exclusive offers, and increased availability of customer reviews. Social shopping destinations Facebook is the leading social commerce platform globally, except among Gen Z, who favor Instagram and TikTok. However, the types of social media accounts that shoppers followed and purchased from varied by age group. Gen Z and Millennials predominantly bought from brand accounts, with Gen Z also showing a preference for social media influencers. Conversely, Gen X and Boomers preferred purchasing from trusted retailer accounts.

As of January 2025, 24.2 percent of Facebook users in the United States were aged between 25 and 34 years, making up Facebook’s largest audience in the country. Overall, 19 percent of users belonged to the 18 to 24-year age group. Does everyone in the U.S. use Facebook? In 2023, there were approximately 247 million Facebook users in the U.S., a figure which is projected to steadily increase, and reach 262.8 million by 2028. Social media users in the United States have a very high awareness of the social media giant. Expectedly, 94 percent of users had heard of the brand in 2023. Although the vast majority of U.S. social networkers knew of Facebook, the likeability of the platform was not so impressive at 68 percent. Nonetheless, usage, loyalty, and buzz around the brand remained relatively high. Facebook, Meta, and the metaverse A strategic rebranding from Facebook to Meta Platforms in late 2021 boded well for the company in Mark Zuckerberg’s attempt to be strongly linked to the metaverse, and to be considered more than just a social media company. According to a survey conducted in the U.S. in early 2022, Meta Platforms is the brand that Americans most associated with the metaverse.  

WhatsApp was the most popular social media platform for Gen Z, or 15-to-19-year-olds, in the Netherlands in 2020, with nearly all respondents using the service. This according to domestic survey information. The messenger service already ranked as the Netherlands' overall most popular social medium in terms of users. YouTube, Instagram and Snapchat were also very popular, all reaching a penetration rate of over 70 percent. Karaoke app TikTok, on the other hand, was much less popular, as only 17 percent of them used the video application.

Why is TikTok low in this ranking?

Chinese video and sing-along application TikTok, formerly Musical.ly, made a global name as being one of the most popular smartphone apps for Generation Z. Here, it seemingly ranks low as the source used ages 15 and up. This age group might potentially fall outside TikTok’s user base. While there is no data for the Netherlands that investigates the age groups below 15, download numbers suggest the app grew in popularity in the Netherlands after Bytedance (TikTok’s owner) merged Musical.ly and TikTok in August 2018.

A clash of generations
Perhaps unsurprisingly, Gen Z uses Instagram and Snapchat much more often than their Millennial counterparts (defined by the source as 20-to 39-year olds). Interestingly, Pinterest was also more popular among the younger generation. The picture gallery app does not rank among the most popular apps in the Netherlands, reaching less than five million people in 2019. Facebook, on the other hand, was more preferred by Millennials than it was by Generation Z.