The quality of being young; youthfulness — the energy, freshness, or naivety typical of youth.
若さゆえの失敗も、経験になれば糧になる。
Mistakes made because of youth can become valuable experience.
彼の若さがチームに活気を与えた。
His youth brought energy to the team.
若さは取り戻せないものだから、大切に過ごしたい。
Because youth cannot be regained, you want to cherish it.