If you have bought your tickets already. It is very unlikely they expire. However, I would not upgrade til you get to one of the parks. Last year I believe I saw signs that said upgrade your ticket for 45 dollars into a power pass. Did anyone else see the same sign last year. With the recent rate increases this might have went up. Depending on the type of ticket the cost of the upgrade might vary. Here is the number for the universal pass department. 1-866-pass-4-fun. They might have the answers you need. But have your questions that you want to ask them written down before you call It is my expirence that they can be very quick to end the call.. Dont forget to call before 5 pm orlando time, they have bankers hours.