I asked this same question of the CM on the phone, so take that into consideration (Edit: by which I mean that the call centre CMs don’t have a great reputation for accuracy). I am travelling with a 14 year old and 8 year old, and the 14 year old preferred the look of the kids’ menu. I was told that she could order the kids’ meal but she will be charged as an adult. We haven’t gone yet, so I can’t confirm what we were charged yet, but that appears to be the policy.
That is fine by us, as I wasn’t trying to get them to give me a discount - after reading all the stories on here about people who order tap water and one cupcake to share, I totally understand by Disney changed the menu. I was just going to make the 14 year old order off the the adult menu, but as long as she eats, I don’t care what she eats! Based on what Jackie said on yesterday’s Disney Dining Show, I’m hoping they might give her a slightly larger portion than the 8 year old gets.