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

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。

youdao

However, the market is growing very slowly, and it is expected to decline this year along with the world-wide economy.

不过，这个市场成长非常缓慢，而且由于全球范围的经济危机，这个市场甚至将开始下跌。

youdao

Perhaps this will work. It is more likely, however, that newspapers’ fortunes will begin to decline—more slowly than in other countries, perhaps, but bad news just the same.

也许这样会有效，但是更大的可能性是报纸业的收入会慢慢减少，也许没其他国家速度那么快，但坏消息终归是坏消息。

youdao

While acknowledging that any forecast is tough, Yum said it expects earnings to significantly decline in the first half of the year, then slowly recover.

FORBES: Yum Brand's Warning Of Lower Profit From China Leaves Sour Taste

It is more likely, however, that newspapers' fortunes will begin to decline more slowly than in other countries, perhaps, but bad news just the same.

ECONOMIST: Japanese newspapers are in worse shape than they appear