He’s 93, he’s run 52 marathons and he’s in the gym six days a week: can this man teach us how to age well?

‘Do not underestimate his drive and commitment’ … John Starbrook (centre) playing water polo at Hampton Pool, London. Photograph: David Levene/The Guardian

I like to think of myself as a strong swimmer. I’m not fast, I can’t dive or tumble turn, but when I get a lane to myself I’ll happily bash out 50 or 60 lengths. Give me a nice big lake, and my idea of heaven is to backstroke into the middle and watch the swallows overhead. I don’t worry that I’ll cramp up or suddenly forget how to float.

But I’ve never fancied water polo. If you’ve not watched it, it’s a sort of cross between swimming, basketball and wrestling, usually played in a pool that’s so deep you have to tread water or drown. There are two teams, two goals, a large ball and an ungodly amount of throwing, catching and flat-out sprinting. Aquatics GB, the governing body, says players can swim two miles in a single game, and need “remarkable stamina” to cope with all the holding and pushing.