As an adjective youthful
is young or seeming young.
As a noun youthfulness is
the vitality characteristic of youth.
youthful
English
Adjective
(
en adjective)
Young or seeming young.
Characteristic of young people.
Synonyms
* lively
* sprightly
* spry
* young
Derived terms
* youthful river
youthfulness
English
Noun
(-)
the vitality characteristic of youth