Youthful
Youthful , adjective
1.
Not yet mature or aged; young.
Also used figuratively.
Two youthful knights.
The youthful season of the year.
2.
Of or pertaining to the early part of life; suitable to early life; as, youthful days; youthful sports.
Warm, youthful blood.
Youthful thoughts.
3.
Fresh; vigorous, as in youth.
After millions of millions of ages... still youthful and flourishing.