People ages 20 to 44 as a share of the total population in 1970, 1980, 1990, 2000, 2013. 1970 data listed in label. Source: US Census and Neighborhood Change Database, tract-level. Click on "Visible Layers" on the map to view data from each decade. Click on the map to view tract-level data. Click here to view our full report on aging.