Pirlo aging isnt really an issue, since the team is entirely setting up for a future without his role
Buffon well people, including myself, made the wrong analysis a year ago that he was finished and past it, yet the second part of the season and at the euro's, he grow once again to an incredible level. He's still the best keeper in Italy, and he's not quitting soon.
Tevez didnt really look like he was hobbeling off last season, and he didnt had a world cup, he'll be fresh to fire again. i expect him to keep this level for this year and the folowing, wich is his last before he returns to argentina.
Barzagli is a hidden issue. He doesnt play for half a year, comes back and is instant world class. He's still gonna play at this level for a while, but fitness seems to be the struggle. Kinda like Nesta, who made Messi look like the peasant he is at the age of 37.
The thing is that italy isnt producing promising centre backs. Ogbonna was by far the best looking prospect so Marotta took him, be he aint quite the new chiellini.