Always mention the fact that you're a senior when you first make your travel reservations. For example, many hotels offer senior discounts. Don't be shy about asking for discounts, but always carry some kind of identification, such as your passport, that shows your date of birth.
Once arrived, the rules get a little fuzzy. Senior discounts (for those 65 and older) are offered at state-run museums but are generally available only to Turkish citizens and E.U. residents. Some of Turkey's domestic airlines offer senior discounts for domestic flights (available to all seniors), so remember to ask when making a booking.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.