How young is too young or how old is to old to read yaoi?

I got to know the term yaoi when I was in middle school about 13 to 14 years old but before that I watched Gravitation without knowing it was considered to be a yaoi anime. I think 12 is a reasonable age to start reading/watching yaoi because thats when children's interest in sex and adult content generally start. Being exposed to yaoi at a young a......   reply