Youthful a. : Not yet mature or aged; young.

Youthful a. : Also used figuratively.

Youthful a. : Of or pertaining to the early part of life; suitable to early life; as, youthful days; youthful sports.

Youthful a. : Fresh; vigorous, as in youth.

Example:
How has Dave Mustaine kept such a Youthful appearance over the years?

Taxonomy
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Defination from the web:
Youthful Essence® - the microdermabrasion system that revolutionizes skin care and provides dramatic anti-aging results. After just one treatment you�ll restore your skin to silky soft younger years. Buy it now ...