However, please know that in accordance with the fair housing laws, no one can ask whether a building or another apartment has children. Age is a protected class under fair housing.
What happens if there is no child there today, and yet 9 months later there is?
I have had really loud people live near me who had no children.
You can ask whether the unit upstairs has - or is permitted to have - wood floors. Another common noise challenge.
This is just a polite "heads-up" from me.
Find a good broker in the neighborhood and let them know you need a top floor unit.