I've never thought about it. But there are MANY children in my neighborhood / subdivision. I would safely say that persons under 18 years of age are at least 1/3 of the population of my subdivision. Sure there are lots of folks w/o children, or empty nesters, but there is no shortage of families with 3 or more children around either. I would say within a 5 house radius there is...
2 houses down, Single mom with teenage daughter. House next to them, Early 30s couple with 4 children. The house next to them, older couple, empty nest sort of. 2 grandchildren that are VERY fequently at Grandma and Grandpa's house. (With the big wheel in the street of course...)
Going the other way, two houses down Late 40s couple with 2 teenagers, next to them, late 30s couple with 2 kids, next to them, couple with young children. Not sure how many...
Going up the street that empties into my yard, there are.
House 1 3 children, house 2 4 children, house 3 none, house 4 unknown, never see them.... House 5 1 child.
Other side of the street.
House 1 none, house 2 none unless you count the owner (he can be kind of childish) house 3 2 kids, house 4 2 kids, house 5 4 kids...
So yeah, you see, the school taxes from my subdivision and heavily used...