The Collaborative International Dictionary of English v.0.48:

Stripling \Strip"ling\, n. [Dim. of strip; as if a small strip
   from the main stock or steam.]
   A youth in the state of adolescence, or just passing from
   boyhood to manhood; a lad.
   [1913 Webster]

         Inquire thou whose son the stripling is. --1 Sam. xvii.
                                                  56.
   [1913 Webster]

WordNet (r) 3.0 (2006):

stripling
    n 1: a juvenile between the onset of puberty and maturity [syn:
         adolescent, stripling, teenager, teen]