lol what's this crap about Falcao having to prove his age?
Realistically he's probably a few years older than his official age. It came out last year that his birth year was listed as 1984 when he was in primary school, but his passport age has said 1986 since he moved to Europe to play football. A bit more info here: http://www.espn.co.uk/espn/sport/story/224023.html.
Obviously it's moot anyway. Diego Costa is definitely older than 25 but he's playing out of his mind these days so it's kind of irrelevant for the time being.