Slighty unrelated, how many "distinguishable/unique" faces/facial styles are there in terms of like "broad categories?" Obviously hard to define but as somebod

Slighty unrelated, how many "distinguishable/unique" faces/facial styles are there in terms of like "broad categories?" Obviously hard to define but as somebody who moved around a lot growing up, I would catch my brain thinking I'd recognize somebody (quite often) only to remember I was in a totally different state than where the person I thought I was recognizing lived.