Wildman,
I'll soon be 70, and have just come back to my workshop after a spell in hospital and Rehab. One of the first things I did was to knock up a couple of metric square nuts for someone - took me longer than it should have, but to be expected after a major back operation, and though a simple thing, hardly worth the description "job", it was a real pleasure both being back home and back in the shop "making stuff". I really missed it (and this Forum) while I was away, so I agree 110% with all the other comments here - go for it, and keep at it, for as long as you can/as long as it gives you pleasure.
BTW, like you I have no one to pass on my (still growing) collection of tools but don't let that bother me at all - when I'm no longer here my wife can sell my stuff if she's still around (she's 3 years my senior) and I've also been toying with the idea of willing the lot to something like Men's Sheds - if we ever get something like that going here in Switzerland.
Just like someone said above, age is just a number, and as a further example, I still do a bit of self-employed project work now and again as an aircraft engineer (I just turned down a job in December because of the appointment for my op) and fully intend to do some more later on, as soon as the Physio has got me fully mobile again.
Just enjoy the shop, and as far as you're able B - GG - R the expense would be my advice.
Good luck.
Krgds
AES