My parents who are in their 70's LOVE Universal Studios and Islands of Adventure. They enjoy almost everything at Universal Studios: Men In Black, Terminator, ET, Jaws, etc. - everything, really. They even tried Back to the Future, which my father probably didn't need to do due to lower back problems. They had a great time at IOA, too. They LOVED Spiderman and Jurassic Park River Adventure. My father rode on Ice of Dueling Dragons and did fine. They enjoyed Poseidon and Cat in the Hat. They even got to the park early and rode Pterantodon Flyers which nearly scared my mother to death!
They also liked to sit and "people watch".
They enjoyed staying onsite at the Hard Rock Hotel with Express priviledges and the hotel's close proximity to the parks, particularly Universal Studios. They didn't have to stand in line for long periods of time and could easily return to their room for an afternoon rest.
They talk constantly about going back.
These parks are for all ages.
Nan