I was married at the age of 26, hubby was 27. We dated for 11 years prior to getting married!
We had discussed marriage when we were dating in high school and were very seriously involved, but my husband didn't want to even get engaged until he/we finished college. He first left for the military at age 18, and could have proposed then, like a lot of his friends who left for training did, but he didn't feel "ready."
Sure enough, 6 months after I graduated from college, and one year after my hubby graduated from college, we got engaged. One year later, we were married. And frankly, I am glad we waited.