Age structure 0-14 years: 26.61% (male 17,143,124 /female 16,378,309) 15-24 years: 17.35% (male 11,072,817 /female 10,779,029) 25-54 years: 40.91% (male 24,916,204 /female 26,612,272) 55-64 years: 7.87% (male 4,538,167 /female 5,375,867) 65 years and over: 7.26% (male 4,079,513 /female 5,063,903) (2018 est.)