|Noah Webster's Dictionary|
1. (a.) Not yet mature or aged; young.
2. (a.) Also used figuratively.
3. (a.) of or pertaining to the early part of life; suitable to early life; as, youthful days; youthful sports.
4. (a.) Fresh; vigorous, as in youth.
Youthful (4 Occurrences)
2 Timothy 2:22 Flee from youthful lusts; but pursue righteousness, faith, love, and peace with those who call on the Lord out of a pure heart. (WEB KJV WEY DBY WBS YLT NAS RSV)
Job 20:11 His bones were full of his youthful strength; but it shall lie down with him in the dust. (DBY NAS RSV NIV)
Job 33:25 His flesh is tenderer than a child's; he returneth to the days of his youth; (See NAS RSV)
Isaiah 54:6 For, as a woman forsaken and grieved in spirit, Called thee hath Jehovah, Even a youthful wife when she is refused, said thy God. (YLT)