Hi...I was wondering if anyone could help me....My mother in law bought 4 world passport tickets (the predecessor to park hoppers I'm assuming) in 1988. 3 of the tickets still have one day left and 1 ticket has 2 days left...when she bought them the lady who sold them said they never expire...anyway we are going on Sat and she is wondering if they would still be valid....any help would be appreciated..thank you