The desire and ability to maintain a marriage is subjective to so many factors you can't possibly set a reasonable standard for it's conditions outside of "man + woman + commitment before God = marriage".
The age thing isn't even something I would consider debatable. If I was a young man, there's probably a very small pool of young conservative American women to choose from. Probably best to wait until you find the right one. 40 years might not be enough for some people.
Not that I married a “naturally born” American woman. I married a Colombian import American who’s extremely politically conservative. Faith and values go along way towards a wonderful relationship, and I truly love hearing her scream at O’Reilly in Spanish to shut up and let his guests talk...