I suppose that some people are both very ready and very discerning. No one's 'luck' is so good as to carry them through for 58 years.
On another thread a whle back I told the story of someone I know who proposed to a woman he had known for only four hours. They're still happily married 41 years later. He didn't propose to her on their first date, but BEFORE their first date. He asked her out for a Saturday night. After making the date but a few days before it -- probably on the Wednesday or Thursday -- he found himself in a bar, chatting up an attractive young woman, when he realized: I'm really not enjoying this. So he excused himself, went to a phone booth (remember phone booths?), called his date-to-be and said "I know we're not due to see each other in Saturday, but I happen to be not far away -- may I drop by and see you?". (Before asking her out he had barely more than a nodding acquaintance with her). She said yes, he dropped over, they had coffee, they talked for four hours, and by the end of that, he knew she was for him and he knew she was for her. I can tell you that the man is extremely intelligent and almost uncannily intuitive; I don't know his wife as well but she is probably much the same. It happens, and, no, I don't suppose luck has much to do with it, except for their good luck in meeting each other in the first place.
Oh, incidentally, one of the things he told her in that first conversation was "I don't believe in divorce".