Source : Webster's Revised Unabridged Dictionary (1913)

Juvenility \Ju`ve*nil"i*ty\, n.; pl. {Juvenilities}. [L.
   juvenilitas: cf. F. juv['e]nilit['e].]
   1. Youthfulness; adolescence. --Glanvill.

   2. The manners or character of youth; immaturity. --Glanvill.

Source : WordNet®

juvenility
     n 1: lacking and evidencing lack of experience of life [syn: {callowness},
           {jejuneness}]
     2: the freshness and vitality characteristic of a young person
        [syn: {youth}, {youthfulness}]