Very good advice, David--from one 70+ to another. I've now lived most of my 70's in France--arrived here at the tender age of 68. Not sure I'd do it all over again, but I'm not at all inclined to give up on adventures.

Your comment about irritating your sciatic nerve with stationary bike exercise concerns me a bit. I've been using one for about a year now and have had bouts of sciatica. I took up the bike because I was afraid of falling (I'd done so several times) and I wanted a safe form of exercise.

But ever onwards into uncharted territory . . .