Personally, I think a successful, early marriage has to do with the people rather than an age. For example, I married at 26 and that could be considered “old” to some. However, I can honestly say that at 18, I wasn’t ready. I was still a very young “child” at heart. Even at 21, I was a significantly different person than my mid 20’s. Also, the guys I dated in my late teens and early adulthood WERE NOT the “one” for me. Love comes when it is ready, I guess. Just a thought.
I was engaged at 21, luckily I didn’t go through with it, but was married at 27, even then I suppose I didn’t do so hot as that chapter has closed, but I still think that the way folks did things a while ago is pretty decent.
People used to get married pretty young and grow together. Nowadays you see everyone wanting to reach full potential then marry, or make a certain amount, or reach that certain career goal. I’m more of a wing it and let God sort it out kind of guy I suppose.