too old?
I'm 65 & I sailed my 53' ketch pretty much alone except for the ocean passages for 2 years. I have finally found a lady to sail w/ me & it sure makes things a lot easier, but I had no problems sailing single-handed.
Marina attendants would freak out as I came to their dock alone, but w/ all lines in place, it mostly went well; I never damaged my vessel or any other, just had to take a second run occasionally. I have no bow thruster, though it might be nice once in a while, but certainly NOT worth the bread.
I fully expect to sail until I die or are too ill to do so. As I'm a full time cruiser, presently in the Windward Islands, sailing, snorkeling & trekking around ashore seem to be sufficient exercise, though I am thinking of beginning a weights regimen for my biceps & shoulders.
I believe that sailing to your physical limitations is the key; it's a hell of a lot easier to shake out a reef than put one in as conditions change. I'm truly happy w/ 125 mile day, reefing for the nite, than I am trying to reef in a squall in the dark.
But I am an experienced sailor, with over 50 years of professional seagoing experience, so I'm pretty much prepared for those occasions when all does not go as planned.
It is shocking to watch the bare boaters & some of the "professional" captains down here, apparently with no knowledge or enough experience to handle the vessels they are driving.
In light of that, Nikki & I are offering those people who might dream of one day cruising themselves, the "cruising experience". For any interested; skippingstonesailing.com
Sorry, a bit off topic.
My father who was a surgeon, did have to remind me whenever I did injure myself,"You're 60, not 35, dummy!", so do stay within your physical limitations, though that's very hard when you've been doing things yourself aboard vessels for so many years.
I don't think age is the problem; prepare for the situation & don't expect everything to go as you plan.