John Lennon's widow Yoko Ono credits her hectic work schedule with her youthful appearance - because she's always on her feet.
The 78 year old admits she struggles to stick to healthy eating programmes and work-out regimes, like so many other celebrities - and instead relies on keeping busy to stay fit and healthy.
She tells, "I don’t do anything particularly. I exercise sometimes, thinking that I should. I go on a diet sometimes, thinking that I should. But I soon get tired of it.
"I truly believe that the reason I am not old and shrivelled up is because I don’t have time to sit on my laurels and nod off."