Youth is a blunder; manhood a struggle， old age a regret。 青年冒失莽撞；成年发奋强；老年遗憾懊丧。 Youth is life‘s seed-time。
2
?成年发奋图强
青年人向前看，老年人向后看 Youth is a blunder; manhood a struggle, old age a regret. 青年冒失莽撞；成年发奋图强；老年遗憾懊丧 Youth is life's seed-time. 青年时代是人生的播种期 .
3
?老年遗憾懊丧
...向前看，老年人向后看 Youth is a blunder; manhood a struggle, old age a regret. 青年冒失莽撞；成年发奋图强；老年遗憾懊丧 Youth is life's seed-time. 青年时代是人生的播种期 .
4
?老年后悔无穷
Youth is a blunder; manhood a struggle; old age a regret. 青年鲁莽灭裂，中年奋斗不止;老年后悔无穷. Happiness is the interval between periods of unhappiness. 幸福是两段不幸福时期之间的间歇 .