Tokyo Population 2024 Impact On Population. More than 1 in 10 people in japan are now aged 80 or older, and the country consistently rates as having the world's oldest population. Chart and table of japan population from 1950 to 2024.

Population of tokyo prefecture in japan from 1920 to 2023 (in millions) If current trends remain unchanged, the nation’s population is expected to decline by about half from 124.