characterized by youth; young.
of, pertaining to, or befitting youth: youthful enthusiasm.
having the appearance, freshness, vigor, etc., of youth: She is 60 but her optimism has kept her youthful.
in an early period of existence; early in time.
Physical Geography. (of topographical features) having undergone erosion to a slight extent only.

1555–65; youth + -ful

youthfully, adverb
youthfulness, noun
preyouthful, adjective
unyouthful, adjective
unyouthfully, adverb
unyouthfulness, noun

1–3. See young. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To youthful
World English Dictionary
youthful (ˈjuːθfʊl)
1.  of, relating to, possessing, or characteristic of youth
2.  fresh, vigorous, or active: he's surprisingly youthful for his age
3.  in an early stage of development: a youthful culture
4.  mature Compare old Also: young (of a river, valley, or land surface) in the early stage of the cycle of erosion, characterized by steep slopes, lack of flood plains, and V-shaped valleys

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
But he has hitherto exerted his powers in a manner, and on subjects, rather
  calculated to gratify a youthful than a mature taste.
He had dyed his white hair in order to look calm and youthful.
Gives legs a firm youthful look and a wonderful feel.
His youthful voice provides a running commentary, of sorts, as he hauls his
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