'Youthful' in the Bible

Though his bones were full of youthful vigor; yet they will lie down with him in the dust.

Do not remember my youthful sins and transgressions; but remember me in light of your gracious love, in light of your goodness, LORD.

Flee from youthful passions. Instead, pursue righteousness, faithfulness, love, and peace together with those who call on the Lord with a pure heart.