Hiya Andrea!
Welcome to planDisney! Visiting Walt Disney World in August is one of my favorite ways of ending my summer season! Before school and those many responsibilities and deadlines I find an end-of-summer Disney jaunt a pleasant diversion.
It's very easy to edit a child's age that is managed by you. Head over to your
My Disney Experience account and log in. Look for your
Family & Friends list. On my computer, it is the first circle icon on the top of three rounded emoji people. I click on "View List" and I can see myself and all the people in my family that I manage. Click next to your child's name the word "Update." It's here that you edit their birthday. Make sure to click "Save."
If you are still having issues I would reach out to the lovely Cast Members that work with
"My Disney Experience, MagicBand and MagicBand+." I think you might be fortunate to overlap your trip with the first day of
Mickey's Not-So-Scary Halloween Party which begins August 11. If you can make it, try to secure your tickets ASAP as it is a can't-be-missed event! It's a lot of fun with a special
parade,
nighttime spectacular, and
character meet-and-greets. Don't forget the candy!
I hope you have a fabulous time no matter what you do! Let us know if you have any more questions!
Happy Planning!
-Nimmy