@ everyone EXCEPT foreveralone2099
This will be my first and certainly my last and only post on this forum.
NONE of you except the OP has even met the person you are talking about (the male) and almost certainly have also not met the OP and yet you all give text-book and home-baked-half-baked opinions as if you knew them both intimately. Not a single post says a word that is supportive of the OP in any way. Apparently you all feel you know so much about psychology and human dynamics to freely and confidently express your own insular and damaging opinions about both the OP and the person she is seeing.
What if . . . try that approach to trying to fully understand a human issue instead of thinking you know all the parameters and all the correct answers, which you don't.
To foreveralone2099: I am male, I am old, I was a professional person, I had and still have PTSD. That said, share all you can with another whilst you can for you never know when a person's life, including your own, may come to an untimely and wholly unanticipated end. Give and take as you wish from the relationship whilst it works for you. When (and if) it no longer works for you then leave it. Until then enjoy life as it is given to you, and truly, you do seem to be enjoying your life to greater extent with this man in it. Good for you and good for him.
What if . . . his wife (or whatever) suffers from dementia . . .
Nobody ever knows the full story but everyone always seems to know the full answer. Anonymity provides a wonderful barrier from which to launch opinions and it is certainly well used on every internet forum where it does seem that everyone knows everything. To posters other than the OP - exactly why are you here? Presumably you too have issues which remain unresolved; not the best position from which to pass your own opinions on to others. So let me add, all of the above is my own humble opinion. Now, what is your excuse for being so negative :)