NEVER have had ANY problems with my dd ordering from the kid's menu after she turned 10. She is 14 now and last month ordered mostly ALL KID's menu items at almost every TS restaurant we went to INCLUDING signature restaurants.
I do hear on occasion (mostly on these boards) that some of the Epcot WS restaurant servers can be picky about that although we have not run into this at all. (and no one ever mentions which restaurant is being difficult about it because I'll avoid that restaurant).
From time to time this topic appears on this board and many have stated that adults even order from the kid's menu.
Now, I've also heard there may be an upcharge from certain restaurants (none which we've experienced first hand yet). And, that is completely understandable as I certainly do not mind paying an upcharge if necessary, because the main reason my dd will order off the kid's menu is because the options on the adult menu do not appeal to her.
(oh and she loves that meaty macaroni dish offered on the kid's menus in many places as well
)
That all being said, we pay OOP, we are TIW card holders. DDP has a lot of rules and guidelines so that can be a totally different story. DDP can be very specific about it's guidelines so this may be a no-no.