I have a friend of 77 married to man twenty years older, so he is 97 now. It worked fine when they were 30 and 50, not so easy now. She is his carer, but still manages to get out by herself a remarkable amount. Second marriage for both. I don’t envy her.
My brother’s wife is about 15 years younger than he is, first marriage for both. It has worked well. They have both had health problems, hers very serious, but things are all right now apart from my brother’s mobility problems.
My husband was six months younger than I, though we were born in the same year. He died when he was 40, so you just never know.
I’ve occasionally been attracted to younger men, never to older ones. Never wanted to marry again, though.