Divorce is a fact of life. It is not avoidable and it can happen at any age. It could happen within the first few years of marriage or after 40 years of marriage. No one knows when the relationship will get to its expiry date. It just happens and you are left wondering how you didn't see it coming.
You probably saw it coming and you lacked the courage to end it as it happens to most of us, but one thing we can't ignore anymore is that marriages end even at 80. In the grand scheme of things, you are really on your own and there's nothing you can do to make a person stay by your side.