At my age of 87, of course I think about that. I have a loving family, am not married again, and appreciate my loving family.
I will not get married again unless some magical force brings me a woman who has shared principles which are airtight. I do not care about their past or imperfections, I do care about character. Courage in particular.
I never cheated on my wife and I had multiple offers over our nearly 20 years. On more than a couple of occasions women would flirt with me right in front of her (or, she interpreted it as that, such as when a woman was chatting with me at a function we attended, though I didn't see what she saw).
No addicts of any kind. Someone likes to drink socially, ok. An alcoholic? Hard pass. Ditto for and especially gambling. Of course, cheating it out of the question though I have not experienced that in my life.
Beliefs are critical. If one believes in G-d, you have a shot if you believe the same. One believes in being a good human being, does not have a temper, you are intellectually compatible to some degree etc. If a couple do not mesh on these matters it is tough sledding.
I feel even worse for the younger generation. They are growing up in a lonely world where even the act of being social in person seems so foreign to them.