See, this is the problem I have with modern Disney. BAck in the day, we took my great grandmother on her first visit to Disneyland in California for her 80th birthday. We couldn't keep up with her, and she rode everything except Space Mountain (but she did Big Thunder and the Matterhorn). These days, with the reliance on thrills and toons, there are not as many options as the things she loved - Gt Moments with Mr Lincoln, Tiki Room, Jungle Cruise, PotC, HM, Country Bear Jamboree, the Mark Twain, IASW, Mission to MArs, America the Beautiful, Adventure Through Inner Space, America Sings, the Subs, the Peoplemover etc.
I do not think they should reduce prices for the elderly, I think they should build more attractions that the whole family can enjoy together. The reason other parks discount is because most of their attractions are based on cheap thrills. The Disney experience should be different (after all, they were for their first 50 years).