At what age do you guys start letting your kids dress up as something scary on Halloween? My 9 year…

At what age do you guys start letting your kids dress up as something scary on Halloween? My 9 year old wants to be chuckie (don’t ask me why idk chase he’s never seen the movie lol) my 7 almost 8 year old wants to be a vampire . I don’t have a problem with it personally but I think some people in my life might so was jw