As adjectives the difference between teenaged and youthful
is that teenaged is aged between thirteen and nineteen inclusive; teenage while youthful is young or seeming young.
teenaged
English
Adjective
(-)
aged between thirteen and nineteen inclusive; teenage
:a teenaged girl
Synonyms
*teen, teenage
Usage notes
*The more common term is teenage .
youthful
English
Adjective
(
en adjective)
Young or seeming young.
Characteristic of young people.
Synonyms
* lively
* sprightly
* spry
* young
Derived terms
* youthful river