I found out I was pregnant with my third the day after I turned 21.
Eldest will be 21 this year and youngest will be 18.
I know I was young and it was bloody hard work but I wouldn’t change it. My eldest is at uni, other 2 at college. They don’t smoke, only one of them ever drinks (middle child) and I don’t think they have turned into bad young adults at all.
However, mine are fully aware that I don’t expect any grandchildren until they have finished education and are in long term relationships. They also know it’s ultimately their choice. Eldest and youngest have no plans yet for even entertaining the idea of children, middle one thinks baby clothes are cute so often gets a reminder!
If I had my time again, I wouldn’t have had children with ExH, I realised as I got older and more mature he was an absolute bellend. I would also have liked to have been financially secure before having children, rather than scrimping the way I did, but again, that was also down to ExH being a financially abusive prick.
I would say anything under 18 though is young.