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Table 2 Adolescence in boys and girls manifests differently with regard to their actual fertility.

From: Evo-devo of human adolescence: beyond disease models of early puberty

Boys Girls
Become fertile approximately 2 years after onset of growth spurt; 1 year before peak height velocity Completed half their breast and pubic hair development by peak height velocity; menarche approximately 1 year after peak height velocity
Remain juvenile in body hair, stature, muscularity and voice Appear feminine, while remain infertile
Muscle spurt and adult stature still four years away; approximately 18 years Adult frequency of ovulation and adult size of birth canal; approximately age 18 years
Learn adult social roles while sexually mature, but not perceived mature by adults Learn adult social roles while infertile, but perceived by adults as mature