Well I'm only 11 going on 12 but I go to Magic mountain's Fright Fest. I'm pretty mature for my age though, and they aren't that scary, well compared to Knott's Scary Farm. It all depends on your maturity for the halloween events.
This year. I went to Cedar Point, King's Dominion, King's Island, Dorney Park, Knott's Berry Farm many times, Six Flags Magic Mountain many many times.