I'd say it depends highly on how long the couple has been together, and their financial situation. For example, I'm getting married in 2 months, and we're both 24 years old, but I also own a house, have a secure career, and have been with her for a little over 6 years. If I were still in college without the means to take care of us financially, having a place to live, or the trust of a fairly long-term relationship, I'd consider it much too soon. As for having kids, having them earlier is probably better for the child if the parents are emotionally and financially capable, and prepared, to do so, since the generational gap isn't as wide and common ground would be easier to come across. However, finding younger couples that are ready for kids is rare, in my opinion.