>>39729156During the Looker Quests in X/Y, you can find documents stating that Emma is 16. Emma mentions you as being older than her.
Game Freak previously stated they wanted to have the protag ages as 16 in gen 5, older than the usual preteens, but lowered them to 14. To keep the "aging with the players" thing and reaching GF's original idea of 16 year old protagonists, this would put Serena and Calem at 16. Some people think Emma's dialogue implied Calem and Serena may be as much as another year older, I like to believe it's a happy middle ground where the characters start off 16 but are 17 as of the post-game. Kalos did have a region that appears to go through four seasons as you travel through it, which I always took as an implication that the journey takes place over a year.
>>39729158What crack are you smoking to think the B2W2 protagonists are older than the XY ones? This has never been said or implied ever, in any game, adaptation, or by any developer.