In reply to Matt Podd:
One of us is suffering badly in the knees, so "finally" appreciate all the lifts around the Chamonix valley that we once used to shun. It's great to get up to the good stuff, then take off away from the crowds. Getting down with less pain is even better.
But if you haven't been for a few years you will be surprised by the increased crowds in the valley. Not nice. Also town is now like Oxford Street, London, rather than an alpine village.
But loads of walking, as you probably know. Also, since you will be driving, you have neighbouring valleys.
Or drive to the Briançon region. Few lifts, but you can just drive up and walk off from the tops of passes... Loads, and loads, and loads to do. 3 months per year worth for us.