The research consisted of seven experiments, some split into two parts, each with a group of between 20 and 57 people aged 19 to 22 years old.

这项研究由七个实验组成，一些实验会分成两个部分，每个部分由19到22岁的20到57个人的小组来完成。

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For example, in one project, students went to a home for the aged to interview old people and write memoires for them.

例如，有一个项目是大学生们到敬老院采访老人，帮助他们撰写回忆录。

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Her uncle, Lingaraj Majhi, says 12 people have died from TB in the village in the last year, including a nine-year-old girl and two middle-aged women.

她的叔叔Lingaraj Majhi说，去年，村中已有十二人死于肺结核，包括一名九岁的女孩和二名中年妇女。

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Help the Aged has said that vulnerable old people are struggling to pay for care at home and those needing residential care are often forced to sell their homes to pay the bills.

BBC: Pensioner power takes to the streets

That means China's old-age dependency ratio (which compares the number of people over 65 with those aged 15 to 64) will soar.

ECONOMIST: Demography

And although imaging studies show that middle-aged people may use different brain regions to do the same old tasks, cognitive tests show that apart from brute speed, the brain's abilities are not diminished in middle age.

BBC: Viewpoint: Just what is middle age?