Well, I'm 40 now and about 5 years ago at Busch Gardens I had my first "episode". I got on the Apollo's Chariot. I LOVE coasters and always have. After the first drop on Apollo's Chariot I got this queasy feeling in my stomach. There were about 6 more drops after that. By the time the ride ended and we were back in the drop off area, I thought I was going to toss my cookies in front of about 200 people. I couldn't get off that ride fast enough. I never did throw up but I was miserable the rest of the day. Then, at age 37/38 (last time I was at Disney), I went on all my favorite rides that I had done many times before. Rock N' Roller Coaster almost made me puke. I then got on ToT and thought I would lose it there. I just couldn't believe it. My mind still wants to ride, but my body won't let me. I believe it has something to do with the inner ear. As you age, that apparatus doesn't respond to the dramatic changes as well as it used to.