I had my first child at 17, and now that she's a teenager I have said to her, that I will financially support her through university, and then a year travelling after university.
If she chooses that she doesn't want that path, that is no problem, I will support her emotionally, but not financially.
BTW I completed my 'A' levels, went to University, and now have a good career, have my own car/house etc, and dc are at private school. So it's not a disaster if people have children as teenagers, but it's bloody hard work, and takes a lot of strength. My parents gave me neither emotional or financial support, I was the black sheep of the family after getting pregnant.
BUT the advantage is that before I'm 45, my youngest will have left school, and I will be in a financial position and a maturity to enjoy the world, and travel and go out with my dh. Which I am looking forward to, rather than the clubbing that the rare occassions I did that and found it awful.
And if there are GC by the time I'm 50, great I'll be able to look after them and be young enough, but also as they are GC I'll be able to hand them back with great pleasure