At Epcot, about the only thing you might want to avoid is Test Track (and Body Wars, but I don't think it's operating anymore). The slow version of Mission Space isn't jerky, and unless you're claustrophobic, should be fine. Rides at Epcot are pretty tame -- which I like! And not because I'm 62 -- I just don't need the fear factor. If you haven't been to Epcot before, be prepared for a lot of walking --it's huge. I enjoy Future World, and sometimes have missed getting over to World Showcase for much browsing. I did the Segway tour last year and loved it, although my feet and legs were pretty worn out by the end of it (that was my 62nd birthday present to myself!) Soarin' is wonderful -- get your Fastpass tickets for it when you first get there.
I don't like the jerky simulator rides (like Back to the Future) either -- altho I'm the one who has to go on Dinosaur in Animal Kingdom with my grandson.
Have a great time!