I'm not sure we can, to be honest. As we get older, we slow down, we lose muscle and things we used to do become harder and more strenuous. This means that older people just don't have the strength to do certain things, or if they do them, they get tired pretty quickly. Obviously, not being overweight and being active are key to keeping going as long as possible but it's part of the natural process of life as we age. It would be great if there were a cure or something we could take to give us more energy but, unfortunately, it doesn't exist.
老实说,我不确定我们能做到。随着年龄的增长,我们的体力会减退,肌肉会流失,以前做的事情也会变得更难、更吃力。这就意味着,老年人没有力气做某些事情,或者即使做了,也会很快感到疲倦。显然,不超重和多运动是保持尽可能长寿的关键,但随着年龄的增长,这是生命自然进程的一部分。如果有一种治疗方法或某种药物可以让我们精力充沛,那该有多好,但不幸的是,这种方法并不存在。