0-14 years: 31.36% (male 33,005,623/female 31,265,463)
15-24 years: 21.14% (male 22,337,897/female 20,980,455)
25-54 years: 37.45% (male 39,846,417/female 36,907,683)
55-64 years: 5.57% (male 5,739,817/female 5,669,495)
65 years and over: 4.48% (male 4,261,917/female 4,910,094)
Layman's term...