As an adjective youthful
is young or seeming young.
As a noun rejuvenescence is
a renewal of youthful characteristics or vitality.
youthful
English
Adjective
(
en adjective)
Young or seeming young.
Characteristic of young people.
Synonyms
* lively
* sprightly
* spry
* young
Derived terms
* youthful river
rejuvenescence
English
Noun
A renewal of youthful characteristics or vitality
Related terms
*rejuvenescent