Determine how many days you want to visit Disney World and around what time of year. Certain times of year are less crowded and thus have discounts offered.
Book your reservations early. Last minute usually means higher prices. Early December offers lower rates because of the season, but you should book by early October for them.
Research package deals offered at Disney World. Often buying multiple tickets, tickets for multiple days or packaging your hotel and park tickets can get you a discount.
Buy children's meals when dining at Disney. Most places will allow you to do this and you don't even have to say it's for a child. Bring along snacks and drinks as well to save money.
Use your senior citizen discounts such as AARP to save money on other things while in Florida such as restaurants outside of Disney World. Call the provider of your senior discounts or check their website to find out local places in Orlando that will take a senior discount.