"Figure 4: The number of people of pensionable age is projected to grow the most","" "UK population by life stage, mid-2020, mid-2030 and mid-2045","" "","" "Notes","1. Children are defined as those aged 0 to 15 years. 2. Working age and pensionable age populations are based on State Pension age for the stated year according to current legislation." "Unit","Millions" "","" "Life stage","Mid 2020","Mid 2030","Mid 2045" "Children","12.7","11.6","11.2" "Working age","42.5","44.4","44.6" "Pensionable age","11.9","13.2","15.2"