At the risk of advancing another unpopular idea...have you guys thought about taking up a different sport? A couple years ago, after doddering around on a Green course at a local event, losing my SI dibber, cutting up my hands taking falls, and bailing out to a simple trail run...I swore 'never again.' Besides I didn't appreciate all the sympathy from younger guys i used to beat, after they saw my DNF.
I still get together with some of my O friends socially....there's some real friendships there. But other sports provide much more satisfaction, and much less frustration than orienteering. And I think it is important to make the shift to them before you get too old.
For instance golf. I took it up seriously 6 years ago, about the time I stopped going to A meets...when I was about your age. Took some lessons, played every week, made some golfing friends....became reasonably competent. And with the competency came enjoyment.
Golf for seniors is kinda like a 'dating game.' If you go out as a single, you'll surely be paired up with three other guys, with whom you'll play for the next four hours or so. Plenty of time to chat, get to know them, and invite for a drink at the 19th hole. And maybe make a date to play together again soon....all in a single afternoon! Have you ever made friends that fast at an O meet?
Other ideas? Sari would like to take up couples dancing. She loves the idea of becoming competent on the dance floor. Her Finn parents for instance, are legendary at the Tango. Or look at this older couple:
Granted, living in the city is a boon when you're older. Many more options than living remotely. Moving at our age is almost a tangible step in estate planning; less 'stuff' for your heirs to deal with as you pare down to smaller, more convenient accommodations. Good luck.