It is possible to get cut price tickets to the Alhambra for example for being over 65, being disabled etc.
You will save about 6 euros per ticket but the problem is that if you have a discounted ticket you have to form a queue at the ticket office so that they can verify your identity and check your age or your official proof id disability etc.
The wait in the queue could be around 20 or 30 minutes.
For this reason you should consider if you can be bothered to wait in a queue or if you prefer to just pay the full price and go straight in without waiting at the ticket office.