The older I get (60 last year), the more this conversation resonates... I remember a pretty heated discussion on the old SoloTripping forum, maybe 12 years or more ago, on the very same topic... iirc, the older you are, the more likely you are to approve of a tracking device, for the dual purpose of relieving a loved one's anxiety, and to guide the search team to your carcass. A lot of the older paddlers at the time seemed to understand that at some point, their desire for independence was trumped by common courtesy to a loved one. I didn't get it when I was 45 or 50... but I get it now (married 39 years this year).
I had a retinal detachment and several tears 2 years ago, which interferes with my depth perception, and makes me a bit unsteady while walking. I almost always have to use a staff now, in the woods. I fell a couple times, including a slide with pack and canoe down an 8' mossy rock, on my last traverse of the Turtle to Clamshell portage in the St Regis... my ability to safely walk in the woods with a pack and canoe is no longer something I can take for granted. On my last trip in the area, I decided to stay on the Hoel/Turtle/Slang/Long Pond route because I'd pulled a muscle down here in MD hiking South Mountain months earlier, it still hadn't healed entirely, and I didn't want to over-do it. This April, I plan to go back to Fish Pond; I left some stuff in the area, and it may be time to recover it... any trip could be my last one there. I'll just have to go slower.
My neighbor is 72, and still rides a motorcycle with his group every Saturday morning... wife worries. He says when he can't do it anymore, he'll trade in for a trike. He asked my wife if she worries about my solo canoeing... I wasn't there for the whole thing, but the gist of it was "I'm concerned, but I know he knows what he's doing because I've been out with him, and have seen that he can take care of himself." So I still have that; but with technology being what it is, I think I'll eventually get something that allows me to just send a daily msg that I'm ok and uninjured. The StarLink system will probably become a more affordable means of "satellite cell phone" comms in the very near future, just in time for that.
What I currently do is simply leave a detailed plan, expected time of return, and time at which my wife should be very concerned and call S&R. The plan is basically a map of the area, the route in/out, or loop, and planned/expected campsites. I have a few legal but not designated campsites (Adirondacks is lovely for this), and for those, I provide a 10-digit MGRS coordinate for her to pass on to the Rangers. I also religiously sign in/out of trail registers.