Mine were pretty young - 19 and 20.
I love having young parents more now than I did when I was young.
We have lot more in common than my friends with older parents - mine were born in 69/70, but I had friends whose parents were born in the fifties and generally I can see quite an obvious difference in attitudes and ... generational similarity? If that made up phrase makes sense.
When I was young I was sometimes embarassed that my parents were younger than others. And we were very poor, which could have been to do with the fact they'd only had a few years working and no time to plan for children (although we weren't planned at all, which isn't necessarily an age thing!).
Looking back they were both emotionally probably not really ready for children and they responded to that in different ways - my mum was, til I was about 14, probably overly strict and protective because she felt that she didn't want her kids to be the stereotype of 'teenage mum doesn't know how to parent'. And my dad was the exact opposite haha - just a huge kid, which was fun for us but was so so frustrating for my mum.
But on balance I love it: my parents don't feel like a whole different species like my strict, old fashioned grandparents did to my dad. We like the same music, they are open minded and 'young' in their thinking in a lot of ways.