I was 21 when I got married.
I was naive to think that people were crazy when they advised me that "marriage takes work". As long as we love each other, what do we need to work on--was what I thought. My marriage lasted 15 years. I don't regret marrying him, because we had 3 wonderful children, and now 3 grandchildren as a result of that union. But, if I had been more observant of "signs" and attitudes of his, I would have realized that we were total opposites in our goals, attitudes, hobbies, etc.
I now am engaged to remarry--at 47 years old. I think I am more mature to make the right decision based on values, goals, compatibility. It is not based solely on love and physical attraction. I hope this marriage lasts--I know I will WORK on it this time.