He's not young, but he's not a weak person, loves his life and his job so he'll be one of those wonderful people who just keep going!
A 90 year old friend of mine gets up at 8am and works until 9pm non-stop gardening, cooking, etc! When it comes to old age if you don't want to die you probably won't!
So Peter Sallis, I should think, will be entertaining us for much longer.
And yes Katie, I haven't got over Dumbledore either!