You asked

I'm looking to find out the most recent projected population figures for the UK for 2018 (or as near to present as possible) for every adult (defined as 18 plus) in the UK.

We said

Thank you for your Freedom of Information request about population projections for adults aged 18 and over in the UK.

Our latest (mid-2016 based) population projections show how we expect the population to grow if currently observed trends continue. The downloadable table Z1 gives the principal and variant projections for the UK by single year of age and sex. From this table the number of people aged 18 and over in the UK in 2018 is projected to be 52,403,344.

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