If you want to irritate me, state that YA fiction “didn’t exist” until about seven years ago. State, when referring to the 1970s and 80s, that “there was no YA then.” My personal reading experience from those years, the years when I was in middle and high school, says you’re wrong. Granted, this wasn’t YA the way we know it now. It was usually published in small, cheap paperbacks that fit easily into a purse …