It's a game. Maybe they just changed the law in AWAM version of the country the live in, or Dylan was thought to be older because he is with Sophia. In the end, it doesn't matter at all. As long as the game remains coherent, everything is fine.
Even more, AWAM is intended to be a porn game. So it is almost mandatory that not everything that happen in this game also would make sense in the real world. Sometimes I get really confused about how much L&P ramblings about a realistic game have messed up the expectations here. No matter which of the stories you look at, all of them will have to go down this path sooner or later. If this game were realistic (for the real world), nothing fun would happen at all in this game. L&P would have to virtually omit all events except maybe the events between Sophia and Liam.
It depends whether or not fans want a 'realistic' veneer to the game, or whether 'porn logic' should dominate. It seems that the Dev has decided on the latter, presumably to please the majority of his Patrons. It must be what he understands them to want & it must make business sense. L&P promised realism in an erotic VN but currently delivers an average teen porn pulp game, realism having been abandoned years ago. It turned out to be the case, that there'd been no need to promise this in the first place. Personally speaking, having played various porn games, none of which were in any sense realistic, or claimed to be, it was the advertisement of realism, all those years ago, that was amongst those things which drew me strongly to AWAM. I've had enough of cartoon characters & stories. We've got an over supply of games to cater for such tastes & the choice is vast.
Realism in the game now seems to consist of the cast members not being abducted by aliens, or having to deal with orcs & goblins & no-one has any special mind-control powers, of course. Once the concept of realism is ditched, it's a case of "anything goes." That may be fine for the "Hey, it's just a porn game," viewpoint but not for anyone who wants something better, i.e. a proper set of story arcs, with believable characters. Fiction has to veer from the course that reality would most likely take but why does this have to produce illogical nonsense? Novels, films & even comics exist which deal with erotic subjects but manage to maintain a kind of realism. Plot holes, retro fitting of storylines, out of character behaviour, lack of immersion for anyone not into M/S incest, etc., have all made AWAM into nothing more than another run-of-the-mill episodic offering, albeit a very slow one.
There's also the question of whose porn logic are we talking about when that subject is raised? Observing the bulk of current porn games, I know it's not mine. L&P should perhaps consider removing references to realism from his mission statement/promo blurb, along with adding a long overdue, male protagonist tag.