I can't help you with the AARP side of the trip, but I could suggest that if you use Facebook, you can look up Provost Park Pass. Chris Provost is an old friend (and current, too, of course) who is now on a world tour of the Disney resorts with his wife and young son in a partnership of some sort with Disney.
They sometimes have special giveaways of passes or whatnot. Even if you sign up and get no free passes or whatnots, you might still get some tips of best things to see or do while there that would help your visit.
Good luck and enjoy your trip when you go.
BTW: I am not in any way associated with Provost Park Pass or any of its activities other than through my friendship with Chris Provost and his family.