pubescent

/pjuˈbɛsnt/

A pubescent girl or boy is a young person who's just reached the age of puberty, or sexual maturity.

Use the adjective pubescent to describe a person who's at the end of childhood growth and is beginning to be fully adult, including being nearly old enough physically to reproduce, or have babies. Pubescent girls and boys are at an in-between stage in their lives, no longer little kids, but not yet grownups. The root of pubescence is the Latin word pubescere, "grow up, ripen, or come to maturity."

Definitions of pubescent

1. adjective

   (of animals especially human beings) having arrived at the onset of puberty (the age at which sex glands become functional) but not yet fully mature
   synonyms:

   immature

   not yet mature
2. adjective

   covered with fine soft hairs or down
   synonyms: downy, puberulent, sericeous

   haired, hairy, hirsute

   having or covered with hair