[diggan]

> I genuinely wish there was a map where you could see how many kids and their age groups are in a given neighborhood.

Maybe your local city/state/county/country government has a "Open Data" portal where they publish stuff like that? Barcelona for example has a pretty extensive Open Data collection (https://opendata-ajuntament.barcelona.cat/en) where you'd be able to find data like that (probably not ready made graphs/maps though), and probably also averaged data about how many people live in the households of a neighborhood, so you could extrapolate for families, etc.