do tickets, like milk, go bad?

[DanenRox]

I bought 7 day park hopper passes today, for our Jan. trip, and will pick them up at will call. Let's say I don't end up going in January, how long do I have to "activate" these tickets. Do they expire? popcorn::

[bicker]

At this point, MYW tickets can be activated at any time in the future.