Unfortunately I don't think so. There used to be something called "Magic Years", which was part of the Magic Kingdom Club (had all the same benefits), but not any more.
I would be interested in this too How about AARP, would they have any discounts for Disney? I suppose I could call AARP ,but I always seem to get more informed info from the Dis boards
Disney offers no senior citizen discounts. AAA sells some Disney tickets at a discount but they must be purchased at your local AAA office prior to your trip. Joining the Disney Club gives discounts on the parks. Simba's Mom is right that the MKC (predecessor to DC) did offer a special rate for seniors. The new club does not.