Population of generations in the United Kingdom (UK) 2015

In 2015, there were over 14.8 million baby boomers in the United Kingdom, making it the largest generational cohort at that time. The millennial generation, or Generation Y, accounted for 13,8 million people, while there were 13 million members of Generation X.

Post-war baby boom
The baby boomer generation is the largest due to the spike in births that happened after the Second World War. In 1947 for example, there were over 1 million births in the United Kingdom, compared with just 657 thousand thirty years later in 1977.

Largest age groups in the UK
The most common age group in the United Kingdom in 2017, were those aged between 50 and 54, with 4.67 million of them, followed by the 4.57 million people aged between 45 and 49. In this same year there were around 580 thousand people who were over the age of 90, and 3.96 million under the age of five.

Population of different generations in the United Kingdom (UK) in 2015

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Release date

March 2016


United Kingdom

Survey time period


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Statistics on "Demographics of the UK"

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