Besides aging, weight bearing is probably a key factor of the increase of anulus fibrosus cells apoptosis.

除衰老外，负重可能是纤维环细胞凋亡增加的关键因素。

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But while genes are certainly an important component of aging, they may not be the most relevant factor, if only because we don't have much control over them.

但是，尽管基因肯定是老化的一个重要元素，但是只要我们不能更好地控制它们，它们就未必成为最重要的因素。

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The team has not yet identified the rejuvenating factor, but they have found a blood-borne compound that seems to promote brain aging.

他们还没有确定重新变年轻的因素，但是他们发现了一种血液中的化合物似乎会促进大脑衰老。

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"The aging factor alone will boost health-care spending from the existing 3% to 7%, " she says.

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Mr. Hong: An aging demographic is a factor in Japan that plays to our strength.

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"Aging eggs cannot be helped and are a risk factor for anyone her age, " Casey said.

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