Stewart Brand majored in biology at Stanford, where his teacher was Paul Ehrlich, a population biologist.

斯图尔特•布兰德在斯坦福大学主修生物学，导师是人口生物学家保罗•埃尔利希（1）。

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The figures suggest that men who become fathers in their 50s and 60s, such as Rod Stewart (66), Sir Paul McCartney (61), Clint Eastwood (66), Frank Skinner (55) and Gordon Brown (55), are still relatively uncommon.

BBC: Older fathers: what's behind the trend?

Over the years, celebrities like Neil Diamond, Elton John, Bette Midler, Paul Simon, Billy Crystal and Rod Stewart have all headlined his events.

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Big names like Paul Simon, Janet Jackson, Stevie Nicks and the craggy Rod Stewart have all been playing to rows of empty seats this summer.

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