You marry one thats 25 and you are 55, then if your lucky she will still be with you when your 75, she will be 45 and probably look 30. You may have run out of money by then and be a bit frail, at which time you will be dumped, and probably she will have a house you brought for her and she will move on to the next rich man.
Same same story I hear every day, and seen it happen so many times often ending up in disaster.