First of all, I love that you used the word octogenarians. For a Scrabble junkie like me, impressive vocabularies make me smile. As for your question, I think you're on the right track being wary of Kilimanjaro Safaris. It does get quite bumpy at times, and seems especially so in the rear of the vehicle. A far milder option would be the
Maharajah Jungle Trek. Guests can wander the path at their own pace, stopping at will to view Asian wildlife. It is wheelchair accessible, too. Likewise, the
Pangani Forest Exploration Trail allows for leisurely viewing of wildlife native to Africa and is also wheelchair accessible. They might also enjoy riding the
Wildlife Express Train to Rafiki's Planet Watch (also wheelchair friendly). Depending upon how mobile they are, your guests might enjoy exploring the
Discovery Island Trails, which offer close-up viewing of various creatures. Of course, if they enjoy feathered friends, the
Flights of Wonder show is a real treat and is thoroughly enjoyed while seated. I'd be remiss not to mention that my Grams (a septuagenarian) fell in love with the vibrant
Festival of the Lion King years ago and insists on seeing it every time she visits! Have a lovely trip.