随着人口平均年龄的增长，有越来越多的老年人需要照顾。
As the average age of the population increases, there are more and more old people to care for.
随着年龄的增长，皮肤的保护性反应——表层血管的收缩减慢，对低温的反应可以增加代谢率，可老年人的代谢率却在不断减弱，哪一代谢机体的下降却不明。
The skin's protective reaction of constricting surface blood vessels is slower with age, and the cold-induced rise in metabolic rate is also weakened in older people, but the mechanism is unknown.
为了抵消随着年龄增长而自然升高的血压，老年人应该吃更少的钠。
Older people should eateven less, to counteract the natural rise in blood pressure that comeswith age.
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