CharlieCards have a five-year expiration date, as Ron Newman discovered. Since they were introduced in late 2006, that means lots of them are going to be expiring soon. Any value you have left on an expired card won't just go poof, however. MBTA spokesman Joe Pesaturo says:
T riders may have the value on their expiring cards transferred to a new one at the T's Customer Service windows at Downtown Crossing (in the underground corridor across from Macy's). We'll be launching a public information campaign very soon.
UPDATE: Pesaturo adds: "Customers with stored value only on their CharlieCards need not worry. Their CharlieCards will be good for another two years past this fall's expiration date."