It's just six years until the Queen's telegram lands on your mat congratulating you on your 100th birthday.
You're taking it easy, right? Slippers on, trips to the coast with a blanket on your lap and a short shuffle to the newsagent's for your Werther's Originals the closest you get to exercise.
Not if you're Fauja Singh - who can regularly be spotted flying down the streets of
At 94, he's run seven marathons (five in
Fauja's jogging skills were developed on an Indian farm in Punjab, and then at the magical age of 81, when he moved to the
Next up? He's set his sights on being a record breaker.
And Asafa Powell might have to watch his back. The Jamaican may have the new 100m record, but Fauja's after eight of them - in one day.
The action starts at 10:30BST with proceeds going to charity and the event is in support of the London 2012 Olympic bid.
So any secrets to fitness? Fauja's training regime includes a daily eight-mile walk and run, no smoking or drinking, plenty of smiling and lashings of ginger curry.
The pounding pensioner is already a superstar. Last year Adidas signed up Fauja alongside David Beckham and Jonny Wilkinson as part of its 'Impossible is nothing' campaign.
And next on the list?
More marathons - and coach Harminder Singh is trying to set up a showdown between Fauja and
Expect some serious fireworks on the starting line.
So, having only run seriously for the last 13 years, when does Fauja think he'll trade in his spikes for a zimmer frame?
"When I die!" he laughs.
So at least another 50 years, then.
San Nakji for President!