I was 20 and my husband was 21. And we lived together for two years before that. 24 years together this year

Yes, I think that is young and I wouldn't recommend it for my girls.
My husband and I grew up in dysfunctional families and we both left at 17/18. We had to grow up fast.
I would like to see my girls experience life and finish college before they settle down.
It's funny too because I always felt I was never going to get married because all my girlfriends in high school had long-term boyfriends and I didn't. I was the first to get married and still am after they have been through even a couple marriages.
When you get married young, I feel you really are growing up and changing together and need to have a lot of tolerance and commitment.