expression, i-adjective
you are only young once; youth doesn't come twice
A proverb encouraging people to make the most of their youth while they can.
若い時は二度ないから、今のうちにいろいろなことに挑戦しよう。
You're only young once, so let's try all sorts of things while we can.
「若い時は二度ない」と言うけれど、本当にその通りだと思う。
They say 'youth doesn't come twice,' and I think that's really true.