When I tap my CharlieCard to the vending machine and look at details, it says that the card (and all of its stored value) will expire on October 31, 2011. I don't see any way to extend this lifetime, nor do I understand why it needs to expire when it still works perfectly well. I'm reluctant to add any more stored value (it now has $6.80).
An e-mail to firstname.lastname@example.org elicited a reply (from ctsservice.com == Cubic Corporation, not the MBTA!) saying CharlieCards expire after 5 years. CharlieCard was introduced in December 2006, so that's going to hit a lot of people very soon. I'm not even getting the full 5 years from mine.
Has anyone else encountered this?
ETA: I don't currently have a monthly pass. The machine separately shows the date when my last monthly pass expired, which was a long time ago.