My first wife couldn't handle the shared responsibility of being married because she was too impulsive with spending and doing things like deciding not to go to work because she didn't feel like it. We divorced after about eighteen months. She was a few years younger than me. We have a son together.
My second wife, who I married last year, is a lot more grounded and similar to me in terms of understanding the type of cooperation necessary for a successful marriage. We have known each other for several years, even before I was married. We just didn't develop feelings for each other until much more recently. She is a few years older than I am and she has a kid from her first marriage too.