And there you have the real answer to the question, "When is a man old?"
“一个人何时变老?”,从这类事例中对这个问题你已经有了真正的答案。
Laplace at seventy-eight died young. He was still unsatisfied, still sure that he had a lot to learn.
拉普拉斯78岁逝世时依然年轻。他依旧不满足,依旧感到许多东西要学。
As long as a man can keep himself in that attitude of mind, as long as he can look back on every year and say , "I grew," he is still young.
一个人,只要他能够保持这种心态,只要他在回首过去的一年时能够说“我在成长”,他就依然年轻。
The minute he ceases to grow, the minute he says to himself, "I know all that I need to know,"--that day youth stops. He may be twenty-five or seventy-five, it makes no difference. On that day he begins to be old.