Neither is your window to education.
I know a couple of young women who married younger, had kids and then got their collage degree. While some classes you have to attend in person many of them can be done on-line. From there you can often open a home based business, computer repair, accounting, heck the one that I know that makes the most money does pet grooming.
Where did I say not go to school?
However, no, your window to get an education is not limted.
My mother went back to school and got her degree in her 40s.
Childbearing is absolutely time bound.