Due to the magic of playing a gorgeous Japanese character (and also playing in two games on one account) and the realization that I've been playing him a certain way in Micro ANYWAY, Rui is now officially aged up to the end of the goddamn terrible augh movie Hana Yori Dango Final. Seriously, I loathe the movie, but Rui's attitudes in Micro fit much better with his attitudes at the end of the movie than they do with the attitudes at the end of the TV show.
What does this mean for you? NOTHING. Rui is now approximately 23 years old. He still looks the same because Oguri Shun didn't bother to age really in the intervening years, and while his attitude might change a little, it's going to be so subtle as to be not particularly noticeable, since as I said I've been pretty much playing him from that point accidentally anyway.
In short, Rui can legally purchase alcohol in the United States now and GO TEAM ME.