spare no effort while you are young; heavy work in youth is quiet rest in old age
Proverb encouraging young people to work hard and endure hardships, as the experience will benefit them later in life.
They say 'spare no effort while you are young,' so let's try various things now while we can.
Standard kanji spelling for this proverb.
Variant with とき in kana; both spellings are used.
A traditional Japanese proverb. The exact origin is uncertain, but it reflects a common cultural value of perseverance and diligence in youth.