“少壮不努力，老大徒伤悲”用英语怎么解释？

An idle youth，a needy age．
Reckless youth make rueful age.
A Young idler,an old beggar
A lazy youth, a lousy age.

If one does not exert oneself in youth, one will regret it in old age.

少壮不努力，老大徒伤悲
An idle youth a needy age

来自金山词霸

Young and vigorous sleep, only sad boss.

A young idler, an old beggar

Young and strong not diligently, the eldest child person is sad