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
Examples:

"the budding breasts of a pubescent girl and the downy chin of pubescent boy"

Related terms: immature
2. [ adjective ] (biology) covered with fine soft hairs or down
Synonyms: puberulent sericeous downy
Examples:

"downy milkweed seeds"

Related terms: biology hairy
Similar spelling:   pubescence