Hi OP, I haven't read the full thread but wanted to post before I lose my train of thought (happens with increasing frequency these days).
You write:
Why does it have to be an either/or situation? I'm in my 50s and very much doubt I would ever "commit to a relationship" again,. I'd be much more likely to just see how it goes, keep it light, keep my own place and not let him move in. I would keep my friends and hobbies (should go without saying but sadly I know women who don't).
If a bloke came on strong to me like this, gushing and blowtorching etc, I'd honestly laugh - it sounds immature - either that or he thinks it's what you want to hear. Younger men usually do this when they're trying to get you into bed. Not that that's a bad thing! Just that maybe it shouldn't be taken too seriously.
Does he tell sob stories? Is he needy? Are all his previous marriages the exes' fault? Is he on good terms with them? Does he badmouth them? Any doubts in these areas and it would be Goodnight From Me.
I would want to find out more about him - either through mutual friends, work colleagues etc. You can tell a lot about someone by their friends. One of my exes had a mate he called Pervy Bob. Well guess what? My ex turned out to be a perv too.
What are his relationships like with his adult kids and have you met them?
I once read that people tell "stories" about themselves - and such stories will tell you who they are, if you pay attention.
I also read that the essence of the problems that will split you up are present in the first few weeks of dating - except we brush them under the carpet and don't pay heed to them.
So if you do decide to go for it, don't rush in, read between the lines and don't put his name on your house / bank account / will
. And good luck!