When DD was 7, she didn't like FJ, though she made it through OK. She has refused to ride it again though. She hated Mummy and actually cried. She said it was too loud. She went on it again at 11 and loved it. She didn't try Terminator and there was no Transformers or Gringotts then.
I will tell you that I am a big chicken when it comes to rides. I really liked Gringotts. I wasn't scared on Transformers, but it was so loud it gave me a giant headache. Mummy scares me; I've ridden it a couple of times. The first time I did OK. The second time was in Jan. and DH and I were in the front row. It was too much for me and I won't be riding it again. Forbidden Journey scared the **** out of me and I actually balled like a baby after that one, LOL.
I've never had any desire to try Terminator.