At 84, Harrison Ford still climbs into a cockpit. He was recently photographed at Los Angeles airport boarding a private jet - not as a passenger, but as the pilot. The man who played Han Solo on screen actually flies in real life, with a licence he has held since the mid-nineties, topped up with specific ratings for seaplanes and helicopters.

There is something rather good about the most famous film adventurer not having played the adventure only in front of a camera. Ford collects aircraft - from restored old light planes to modern jets - and travels in them with his wife Calista Flockhart and son Liam. In thirty years of flying he has had one accident: in 2015 he had to make an emergency landing on a golf course in Venice, California. It ended in fright, not tragedy.

What is more interesting than the planes is the routine. His diet contains no dairy and no meat - he cut them years ago. There are vegetables and fish, with an emphasis on oily fish like mackerel and salmon, for the omega-3. He lifts weights and does basic cardio, walks and runs, and has a small gym at home. At 84 he plays tennis and rides a bike.

None of that is a secret, and that is exactly why nobody is selling it. There is no supplement with his name on it, no twenty-eight-day programme promising that you too will be flying at eighty. Just decades of habit and a refusal to sit down. When the longevity industry offers you everything except this, it is worth asking why this is the one thing nobody charges for.

His private life divides into three marriages and five children. With Mary Marquardt, his first love from high school, he spent fifteen years and had Benjamin and Willard. With Melissa Mathison he had Malcolm and Georgia. With Calista Flockhart, whom he met at the Golden Globes in 2002, he has lived since 2010 - eight years together before the marriage, fifteen years of marriage since. Liam, whom Flockhart adopted in 2001, he then adopted as well.

Retirement is evidently not on the list. And that is the point - not that anyone at 84 must fly, but that the decision about when enough is enough is still his. How many people here get that choice at that age?