Stage of children by age preschool age 3yr~6(7)yr school age 6(7)yr~11(12)yr adolescence 11~12yr-17~18yr(fema) 13~15yr-19~21yr(male) 儿学R的preschool age 3 yr～6(7) yr school age 6（7）yr～ 11(12)yr adolescence 11 ～ 12yr--17 ～ 18yr(femal) 13 ～ 15yr---19 ～ 21yr(male) Stage of children by age