Yep, DGD turns 10 on Sunday, we check in tomorrow. It’s her last trip as a Disney kid, since our trip begins before her official birthday. And the main reason we are letting her play hookey for 2 days (shhhh)
Just like, if you begin your trip 1 day before you turn 3 you are free the entire trip, even if the trip lasts 14 days.
It’s all about what age you are on the day the trip starts, never what age you turn during the trip. One of the few times Disney does something in the guests favor