Strong's Concordance

Original word: שַׁחֲרוּת
Transliteration: shacharuth
Definition (short): life
Definition (full): a dawning, juvenescence

NAS Exhaustive Concordance

Word Origin: from shachar
Definition: blackness
NASB Translation: prime of life (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From shachar; a dawning, i.e. (figuratively) juvenescence -- youth.

see HEBREW shachar

KJV: Therefore remove sorrow from thy heart, and put away evil from thy flesh: for childhood and youth are vanity.
NASB: So, remove grief and anger from your heart and put away pain from your body, because childhood and the prime of life are fleeting.