兰西说，在约18个月大的时候，大多数孩子很渴望帮助父母，在许多文化中，他们在这个年龄开始帮助做家务。

At about 18 months of age, Lancy says, most children become eager to help their parents, and in many cultures, they begin helping with housework at that age.

youdao

它在青年时期达到顶峰，在一段时间内趋于平稳，然后普遍会开始随着年龄的增长而缓慢下降。

It peaks in young adulthood, levels out for a period of time, and then generally starts to slowly decline as we age.

youdao

随着年龄的增长，他们也开始工作。

As they grew older, they worked, too.

youdao