The low fertility rate in many of that continent's more developed countries means their populations are ageing and shrinking.

欧洲大陆的许多发达国家出现了过低的生育率，而这意味着这些国家的人口正在面临老龄化与减少。

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If ageing is not the result of chemical catastrophe but driven by changes in regulatory genes, it could, in theory at any rate, be slowed down or stopped.

如果老化不是化学过程造成的灾难结果，而是由于控制它的基因发生了改变，那么从理论上说，在任何水平上，老化速度都可以被减缓甚至停止。

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The findings, based on a study of more than 600 volunteers, suggest that an increased metabolic rate actually speeds up the ageing process.

这项发现是在研究了600个志愿者后得出的，并表明新陈代谢速率快实际上会加速衰老。

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It said immigration was needed to help offset a slowing birth rate and ageing population, and it needed to find a balance between the number of Singaporeans and foreigners in order to sustain its rate of economic growth.

BBC: Rare mass rally over Singapore immigration plans

Mr Randall said his annual report, which is due out at the end of October, will highlight key demographic factors, including a falling birth rate and an ageing population.

BBC: Scotland's population falling

Although the mortality rate is predicted to continue declining, due to a growing and ageing population the number of deaths is expected to rise to about 182, 000 deaths by 2025.

BBC: 13,000 cancer deaths 'can be prevented'