young·ster /ˈjʌŋ(k)stɚ/
  年青人,少年
  Young·ster n. A young person; a youngling; a lad.  [Colloq.] “He felt himself quite a youngster, with a long life before him.”
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  youngster
       n : a young person of either sex; "she writes books for
           children"; "they're just kids"; "`tiddler' is a British
           term for youngsters" [syn: child, kid, minor, shaver,
            nipper, small fry, tiddler, tike, tyke, fry,
            nestling]