Originally Bespoken by
Kawaii Ryűkishi
Lydia is seven at first, but there's no account for exactly how much she aged by the time she returned from the World of Phantom Beasts. And considering she goes back to stay there at the end of the game, there's no telling what age she should be in The After. (Like I said before, she should really be dead.)
Fan reaction would've been even more critical if she's been left out entirely, though - how many Rydia fans
wouldn't be a little disappointed to discover that their favourite character had died from old age barely five years after the events of the original game?
Besides, it'll be interesting to see how they justify her being there: perhaps something compelled her to leave the PB World after only a few months, or perhaps that world allows people to remain somehow ageless, once they're adults. They'll either have thought of something, or else they'll simply fail to mention it and hope few people notice.