Carstensen解释，一是由于老年人比较挑剔，他们比年轻人更会避开影响情绪的悲伤场合。

One explanation for this, says Carstensen, is that older people are more selective, so they may simply avoid sad situations more effectively than young people.

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And what will happen is as a result, I experience sadness, because that is what I am thinking about, and sadness-- a painful emotion, not a positive emotion-- leads to further narrow and constrict.

结果就是，我感觉悲伤，因为我一心只想那个，悲伤-,是一种痛苦的情绪，一种消极情绪-,导致进一步的收窄缩紧。

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