少壮不努力,老大徒伤悲 meaning in English

It will be too late to bewail the time wasted in one's youth.A man who does not work hard in his youth will be grieved when he grows old.An idle youth,a needy age.A young idler,an old beggar.Idly young,needy old.If one does not exert oneself in youth,he will regret in old age.One who misspends his youth will grieve in vain in old age.