https://www.census.gov/newsroom/blogs/random-samplings/2016/06/americas-age-profile-told-through-population-pyramids.html https://www.census.gov/newsroom/blogs/

https://www.census.gov/newsroom/blogs/random-samplings/2016/06/americas-age-profile-told-through-population-pyramids.html https://www.census.gov/newsroom/blogs/random-samplings/2016/... You are right, but I think in the 10 years lots of the 55-59 people die off so wont be larger. Then the pyramid shrinks.