Hyatt Hotels has both AAA and senior rates. Although, they are subject to availability. Go to the general Hyatt website or visit the specific page for Hyatt Regency Orlando International Airport and check the "+" box to select either special rate option. Keep in mind, in many cases, the discount for AAA is identical with the senior rates.
FYI: According to the Hyatt website, you can get seniors rate if you are 62 or older. If you click on the "i" icon next to the Select a Special Rate on the Hyatt website, you will find this:
"To qualify for the Senior Citizen Rate, you must be 62 years of age or older. Valid identification must be presented at check-in. Senior citizens may only book one room at this rate during their stay."