On Youth and Old Age, On Life and...

论青年和老年，论生与死，论呼吸。

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According to a study, the average Briton believes that youth ends at 35 and old age begins at 58.

一项研究表明，英国人普遍认为青年时期在35岁结束，老年时期从58岁开始。

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Younger people, those aged 15 to 24, thought youth ended at just 28 and old age began at 54.

年龄在15岁到24岁之间的年轻人认为青年时期在28岁时结束，老年时期从54岁开始。

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The similarity of the SNPs was then compared with other aspects of the individuals' similarity in this case, with their cognitive ability in both youth and old age, and how much that had changed over the years.

WSJ: Intelligence Changes Linked to Genes

He was referring to "The Voyage of Life, " a series of allegorical paintings about childhood, youth, manhood and old age, a set of which resides at the National Gallery in Washington.

WSJ: Hudson River Schooling

Until very recently, most of the increase has been due to better survival in childhood and youth, rather than the increased prolongation of middle age into old age.

ECONOMIST: Why women live so long