I had the same question last year for my then nine year old daughter. We had ten day tickets with no expiration. We used five days on our trip last june and the other five earlier this month on a surprise trip with my sister and her family. My daughter turned ten in september. We had no problem with her using the child card even though she is technically an adult ticket age now. The one thing I would advise for you is to keep your ticket safe when you return home. Turns out our cards had become magnetized or demagnetized or whatever it is that makes them not work so well, this wasn't a big problem though, the cm at our hotel just transferred the left over days to our new room keys. My biggest fear while we were preparing for this trip was knowing wether or not our days where actually on the cards. You can not call WDW for this info. They need the card in their hand to verify the ticket information. Have a great trip!