The Office for National Statistics (ONS) released a new report on Friday saying that the population of Britain has hit 66.4 million, the slowest growth rate since 2004.
Between 2017 and 2018 the population increased by 0.6 percent, with global migration being the main contributor to population growth.
The report also showed a shifting age structure towards older ages, the number of people aged 65 and older are expected to grow by 8.2 million, equivalent to the population of London, in 50 years.
Sarah Coates, from the ONS Center for Ageing and Demography, said that "The structure of the UK's population is changing. People living longer and having fewer children means the age structure is shifting towards later ages. The ways in which people live are also changing with cohabiting families the fastest growing family type and more young adults living with their parents."