Grandmother Sarah Lee works a 54-hour, six-day week. So what? She is 87 years old.

Ms Lee holds down three jobs, including an evening post at a telesales company, where she sells double-glazing. Fed up, she left the firm over a month ago - only to return a few weeks later. "They started begging me to go back so I've gone back," Ms Lee tells People. "Telesales isn't easy but I made quite a lot of leads and that's what they want. People seem to love my voice."

A self-described "Cockney", she commutes to work by bus, which takes her an hour. "I'm very very lucky. I am a very healthy woman." By day, she works from home in administration.

Twice-widowed, Ms Lee says she has no plans to slow down. "What would I do? Sit and watch television all day? Work keeps me busy and it's good for my brain. My son thinks I should slow down but I don't take any notice."