Forecasting Behavior With Age Period Cohort

Projections of the Size and Composition of the U.S ...

AGE COmPOSITION. As shown in Figure 4, the popula-tion is projected to age over the coming decades, with a higher pro-portion of the nation’s total popula-tion in the older ages (65 and over). Overall, the percentage of the total population that is under the age of 18 is projected to decrease from 23 percent to 20 percent between 2014 and 2060.