youth

[1]	childhood , young person , younker , boyhood , girlhood , spring chicken , young manhood , young womanhood , prepubescence , pubescence , adolescence , salad days , immaturity , minority
[2]	child , young , youngster , schoolchild , teenager , teen , minor , juvenile , adolescent , boy , schoolboy , stripling , young boy/man , lad , laddie , whippersnapper , girl , lass , lassie , schoolgirl , maid , maiden , (Literary) damsel , demoiselle , mademoiselle , (Colloq) kid , (little) shaver , (US/Canadian) tad , (Slang) teeny-bopper , (Brit) sprog
[3]	children , youngsters , juveniles , adolescents , young people , young , (Colloq) kids
[4]	early days
[5]	youthfulness , juvenility