I might be interested.
Though I - personally - feel that people going on a "Pokémon Adventure" when they're 18-19 or older is a bit... Out-of-character for the pokémon-verse. Of course, I understand that most people don't really have a desire to play as 10-12 year olds (myself included), but from what we see in the anime at least, most people who're past their mid-teens either have jobs or careers, and the only "adults" that go on journeys are either the region champions, the elite four or random-ass characters-of-the-week who we never see again.
That said, what exactly is the focus of this RP? Are we just trying to be group of friends who're trying to re-live the excitement of their first journey (apart from André who never wnet on one)? Are we going to be doing the gyms/contests? Are we aiming for the pokémon league? Is it just gonna be a "wander around and get into random mischief"-type of deal? I really prefer to know what the story's plot is before I sign on for something, y'know? ^^
Most Pokémon RPs that I’ve joined, have some reasoning for the characters to be older. Because like you say, most people don’t want to be 10-12 year olds. In this case, I’m hoping the characters became successful at something (I.E. André became a Movie Star) and didn’t have time to go on a Pokémon Journey, even though they all talked about and dreamed of going one together.
I’ll be honest, the plot of this RP is a recreation of the X and Y games, but with our characters as the protagonists/rivals, and adjustments made to include Xerneas, Yveltal, and Zygarde into the story. (As opposed to just one of them, and no Zygarde.)
So yes, there will be Gyms/Contests, There will be random mischief, and most importantly the characters trying to rekindle their friendship.
I’ll take any input. ^^