Seriously though, even we started thinking similarly, influenced by the Italian meaning of "young footballer".
Marchisio will be 25 in 4 months. I do, and I think many of you here too, consider him a very young player who has all the time in the world to improve. We see him as a player with potential who, with time, might become an excellent midfielder.
The reality is that he's already in his best footballing years and there won't really be much improvement from here on.