My maternal grandparents were young when mom was born. Grandma was just 18 but grandpa was young too. He was just a 19 year-old college kid.
Yet, they settled down, had two more kids and are still together. Both my younger sister and I are currently pregnant so yes now they're going to be great-grandparents at just 65 and 66 years old.
But honestly, if a college kid becomes a father at just 19 years old and lets say he does stays like grandpa (doesn't bail), would he still be mature to be a father? I can't help it. He's just a kid and his brain still needs to fully develop. That's too young even for a woman to be a mother.