It's an individual choice. Some men I consider very handsome have wives or mates that I don't consider beautiful, but they seem to love them (as far as I can tell because I barely trust any relationship anymore).

There are beautiful women partnered with some old, homely men who are rich, so I automatically consider that the reason they are together. It goes the same for older women and much younger men. Personally, regardless of my body or my looks, my ex is small, an inch shorter than me (he wasn't always), probably weighs less than me (since jail food is not too tasty), and all around aged poorly. He looks at least ten or more years older than me. But I loved him. Once you are together for a while, you have the memories, and that mate remains attracted to you and you to them. Only sometimes, I realize. One of my daughters gained 100 pounds during college and grad school. Her longtime boyfriend dumped her. It turned him off. Now he is bald and very homely (IMO) and probably wished he had stayed with her. Looks are so important, but as much as we wish, they do not last.