It is the classical phenomenon of when most people of a distant group are normal, but a minority is peculiar, that you don't notice the normal ones because they are overshadowed by the minority. E.g. when in school, I always remember not wanting to get into trouble with older generations, but then wondering why the younger ones did so when I was older. It is probably the number of trouble-makers didn't change, just that while I was younger I didn't blend out all the normal ones who were my age, which I did when I was older.
