At the preschool/early elementary school age, it seems that in USA most birthday parties are held at some sort of party venue (e.g. bowling, minigolf, bounce castles, build-a-bears).
Obviously, at certain age, that stops being the trend and birthday parties at home become acceptable.
Is there information on what age the at-home parties become the norm in USA instead of party venues? I'm assuming it's based on an age when kids can entertain themselves, but that's just a random guess.