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In the UK, most people retire at the age of 65. But the Queen, who has just turned 90, is still working to a punishing schedule - and showing no sign of wanting to retire. And she's not quite the only nonagenarian still enjoying going to work. The ÃÛÑ¿´«Ã½'s Tony Bonsignore tracked down three other people who are also entering their tenth decade still in the workforce.