I last rode 30 years ago. I've got the itch again and find the Vulcan 2000 LT Classic irresitable. I'm in good health and good shape, but probably older than most of your fathers. Am I biting off more than I can chew with this bike?
Well, unless you're over 80, you're not older than my father.
Short list for me; I'll be 60 in April. I have some significant physical problems. My last bike, after owning several street and dirt bikes, was a 750 Honda, sold in 1979 or 80, can't remember.
I bought a new 2010 vn900 Classic LT last August 27th, instead of a vn1700 Classic or a Honda vtx1300, both of which I would have loved to have owned. I bought the 900 because I was very concerned about not being able to handle the weight of a bigger bike.
It took me a few weeks to knock all the rust off of my old skills, but the main thing that I quickly learned was that it isn't strength that I needed to worry about. I dropped my baby twice, the first week I had her. I can't handle
the weight of the 900 either. I dropped her because my balance was atrocious, not because of my physical problems. Not many people can hold up a 650lb bike, when it leans too far, any easier than they can hold up an 800lb bike.
So, now I regret my thought process at the time of purchase. I'd be happier with a bigger bike. I don't have many years left and don't have a big budget to waste on these toys. So, I'm stuck with the 900 for a while, maybe forever.
IMO, that's a big point that you need to take into account, when you buy your bike. You say you're an old timer that's in good shape. I say, make the best of the years you have remaining. IOW, take as big of a bite as you dare. You only live once.