'So lithe,' they say. 'So spry and sparkling. So uncannily youthful. How on earth do you do it?'
Well, what can I tell you? An hour of tai chi first thing in the morning, an HIIT work-out with my personal trainer, a bowl of steamed kale and a handful of almonds for lunch, and then two hours of yoga in the afternoon followed by an ice bath - this is a routine which I'm sure would work miracles for anyone of any age, although I can't be entirely sure because I haven't myself adopted any aspect of it at any point.
Fortunately, during my life and career I have been given all sorts of advice and learned huge amounts from some great and enormously talented people. I've been blessed to play characters such as Derek Trotter, Granville, Pop Larkin and Frost, who have changed my life in all sorts of ways, and taught me lessons that go far beyond the television set.
And I've worked a few things out for myself as well, about friendship, ambition, rejection, success, failure, adversity and fortune. With any luck, some of these thoughts and observations will chime with episodes and challenges you have faced, or are facing, in your own life.
And if they don't... well, hopefully, at the very least you'll get to have a good old laugh at my expense. So lean back, pour yourself a glass, and try not to fall through the bar flap . . .