20.1 Million (9.8%) 77.2 Million -(37.6%) 34.8 Million (12.6%)- 107.7 Million (52.5%)- (a) U.S. Age distribution in 1970 70.3 Million (20%)- 162.2 Million (58.9%) (b) U.S. age distribution in 2000 92.6 Million -(26.4%) 78.4 Million -(28.5%) 188.2 Million (53.6%)- (c) U.S. age distribution in 2030 19 and under 20-64 Over 65 According to this pie chart, which age group made up almost 38% of the population in the year 1970? between 20-64 19 and under 64 and under 64 and older