In the category of fun with 2020 Census data, here’s an animation of the projected US population by single-year age from 2022 to 2100, with color-coded “generations.” Note that the data for age 100 includes all those age 100 or greater.
The census projections are based on an average immigration scenario.
The projections for incoming population are clearly smoothed approximations.
Data is from www.census.gov/...