I'm 64 and I've been to Orlando about 40 times. For the three or more generation trips, I did one as the grandchild, nine as the child, and one with four generations where I was the second oldest generation. On that one I took my 85 year old dad to two days of Flower and Garden at Epcot (something that both of us had always wanted to do) and OMG all dad's kids and grandkids (one great grand kid only at the point) all ended up coming for part of the time too. We also did one day at SeaWorld. My dad and our entire family loves that park and it's a bargain compared to Disney parks and probably IMHO the best park in Orlando for a multigenerational group.
Note: We are more budget oriented than many and always stay offsite (usually get two condos at one of the nice offsite timeshare resorts and a rental minivan) and also use one grandson's car (we have one in the family that lives in Orlando). Also usually in a six day / seven night trip we only do two or three theme parks and do a lot of resort and less expensive activities on the other days which are very enjoyable too (We are just so excited to all be together). As for a
scooter, in fact my dad at 85 would only consider Orlando or one of our homes as a vacation destination. He loves how scooter friendly the parks are. At home uses a cane, but he loves the freedom that a scooter gives him at the parks. In case you are interested, we have most often stayed at one of these two condo timeshare resorts: Sheraton Vistana Resort or Cypress Pointe (great value for price -- often we do owner rentals and a trade of the timeshare condo in Sedona. Cypress Point often has good retail prices too.). With dad we request and have always been able to get a nice first floor unit.
The other place we have done multigenerational trips a lot are at a great timeshare resort in Sedona, AZ. Our kids have a great fondness for our trips to both of these places. Not to be a "Negative-Nellie" about Orlando at all, but I think they even look at Sedona more fondly than Disney thinking of their grandparents as it was more nature and family time. They all are in love with Disney and SeaWorld (like Universal too), but there are so many entertaining things that are in Orlando while there is lots of family time the way we did it too, the Orlando trips don't conger up the family memories as well as Sedona does. We all though have an unbelievable fondness and memories of both places.
With my dad no longer traveling, I think the days of the multigenerational WDW trips for me are over. Dad's doing great, but he is in an Assisted Living apartment now and doesn't do more than an occasional day trip to my brother's house 10 minutes away or a scenic drive with me when I am visiting. I though also don't have grandkids. DH and I like to travel with DS and his husband though. We are taking them on two trips with us in 2025 -- late February (Puerto Vallarta) and July (Glacier National Park). Do realize though that my spouse doesn't like Florida, theme parks or Disney. That doesn't totally slow me down though. In early February I am going to be in Tampa for two days to visit a cousin who lives in assisted living there and then I am staying three nights with my favorite nephew who lives in Orlando and my son is traveling with me too. And with those two fun guys we're doing a day at the Magic Kingdom and dinner at Ohana and then a day at SeaWorld -- I do though there need to leave the SeaWorld park by 5 p.m. for an evening flight home.
Yes -- I was brought up to be a Disney girl and the place has so much nostalgia for me, and each time I go creates new great memories too.