The only situation I can see where marriage at a young age makes sense is if both parties do not have any children with a parent that is not the other party, and children are desired. Yes, there are a lot of broken marriages, but it's the price to pay to have the canonical situation for a family - and in any case, if you have kids and you're not married, you're still going to pay through the nose for child support. And if you GeoMax, the only way to get the mama into your country is to marry. Perhaps a strategy is to build up enough separate assets (which could be done in an IRA or 401K at an employer in which the employment had ceased before the marriage - and consider any post-divorce support as the costs of raising a child; if you think it's something you can't afford, then simply let your genetic line die.
Marriage at an advanced age makes sense if you want to get a young woman to essentially be your caretaker. If you have never had children, it's an easy choice, but if you did have children, you do have to determine a proper partition for your new wife and your existing children. Just don't be ridiculous like this old coot: