多种因素导致了年轻人比例的长期增长。
A variety of factors contribute to the long-run increase in the share of young.
我们大部分人大约在25岁会初次看到有了灰色头发，有多种因素导致我们出现白发，基因、吸烟、喝酒、压力等因素都会使头发变白。
Most of us spot our first grey hairs around the age of 25, and everything from genes to alcohol and smoking have been blamed for kicking off the process.
这一观点得到了多种因素的支持，这些因素可以导致婴幼儿转化信息的方式与年龄较大儿童和成年人回忆的方式出现不一致。
This view is supported by a variety of factors that can create mismatches between very young children's encoding and older children's and adults' retrieval efforts.
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