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.
也许最令人兴奋的是研究表明，像编织和钩编这样的手艺可能有助于防止因年龄增长而导致的大脑功能下降。
Perhaps most exciting is research that suggests that crafts like knitting and crocheting may help to keep off a decline in brain function with age.
尽管举办了这一庆祝活动，爵士乐在美国的听众人数仍在下降，听众的年龄也在上升，爵士乐不太受年轻人欢迎。
Despite the celebrations, though, in the U.S. the jazz audience continues to shrink and grow older, and the music has failed to connect with younger generations.
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