In my teens-20s, I wasn't finished "doing me" yet, so having children was not an attractive idea, nor was marriage. It all seemed a bit more palatable in my 30s. We all know what we know because of our chosen experiences. I don't know what you all know about having children in my teens-20s because of my choices; you don't know what I feel I know about my wisdom of waiting. I don't understand waiting to have children in my 40s or older....I go to "WHO, in their right mind......???" Our experiences are what they are.
When I did have my child, I totally appreciated the experience. I didn't feel like I had missed out on anything I might have needed to get out of the way. I liked starting late and finishing early. My only regret was that my mother didn't get to spend a lot of time with my son; she died when he was 3, but she got a total kick out of him in the time they had together.
The only other grandchild was about 20 years older.