Do many men in their late thirties to early fourties already have children?

What's a common non-verbal signal or shared team joke that only your squad would understand?
If I’m 36 and a female, is my only option a guy with children since a lot of girls are selfish?
Even if it was practically possible to get to the edge of the universe, my theoretical assumption is that there will yet be another universe adjacent to our universe. Is this true or false?