I had a similar age gap with my DP, had my first baby at 18.
We were happy for 22 years, until I was Widowed (he got Cancer).
Now I'm 48 and my DDs are all past the age I was, but two around the same age, it has changed my perspective.
I wouldn't regret my first DD, but I do wonder why my DH thought it was a good idea to get me pregnant. I was a teenager in love, I wanted the romantic set up.
I don't doubt he loved me, but in the early days, thinking about it, it was very selfish of him. I should have been encouraged into education etc.
I didn't want mad holidays, drinking etc, so I was right to persue the relationship, we were very happily married.
That was the mid 80's, it does compare to the Opportunities and Choices available now.