Nah, the official Japanese site still lists him as 15. Generations was careful not to specify Sonic's age during the birthday party scene.
The list of characters considered significant enough to have their own profile page on that site is kind of weird. Absolutely none of the Sonic 06 characters (Elise, Mephiles, etc.) are there, which isn't a bad thing, but Emerl is there, which is both cool and bizarre.
Because Emerl is amazing and was in two Sonic games unlike the 06 characters.