I know people who really knew who they were at a young age, and they made very wise choices in their mate selection even though they were young (early 20s.) I’ve known some others who were older and did not necessarily make wise choices.
I don’t think age, per se, is necessarily the issue. However, many times, younger people think that it’s “time” to get married, because they’ve reached a particular milestone in life (their friends are all getting married, they’ve just graduated from high school, college, or grad school, or they’ve finally moved out on their own, etc.) To marry just because one is in a relationship and everyone else is getting married isn’t a good idea. However, sometimes those younger years offer the BEST time to meet someone of like faith, like interest, similar family backgrounds, etc. It really depends.
I can only speak for myself. I had several “serious” relationships (two to three years each) when I was younger. However, NONE of those guys would have been a good husband for me. I give all the glory and praise to God that He, in His infinite wisdom, did not permit me to have what I orginally had been asking him for in terms of those relationships. Thank God I did not end up with any of them.
As I grew older, my tastes in many things, including the type of man I wanted to marry, changed dramatically, as I learned what was truly important to me in life. Unfortunately, I had to wait a very long time to find it. I even broke an engagement to an amazing, wonderful, sweet, precious, and very good looking gentlemen when I was 30 years old, simply because I knew in my gut that God had a different path for my life. One of the hardest things I ever did was to end that relationship, especially at the ripe old age of 30, lol. Believe it or not, it actually was another 15 years before I met and, two years later, married, my DH!
So, I don’t think age, in and of itself, is always a defining factor in whether someone is too young to get married (as long as the person is an adult and can take care of himself or herself and a potential family.) It’s just important to make sure that you know yourself, you know what you want in life, and that you truly want to get married for the RIGHT reasons.