Maturity plays a much more important role than age. Some people are never fit to marry, some have what it takes by the time they are 16/17. It's not often that it plays out well for the youngest ones, and since each year brings new experiences and understandings each year moves along the bell curve of "marriage readiness". So is it more likely that a 24 year old is more ready for marriage than a 18 year old. Yes. Is it guaranteed? No. I know some 50/60 year olds that still aren't ready for marriage. They just never learned the skills it takes to have a healthy marriage. Giving an age as a hard cutoff is too arbitrary a measure. Age doesn't guarantee shit.