pubescent

Adjective
  1. (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 (synset 301494602)
    "the budding breasts of a pubescent girl and the downy chin of pubescent boy"
  2. Covered with fine soft hairs or down (synset 300215202)
    "downy milkweed seeds"

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