In ever league other than Serie A, age is a factor. I wouldn't worry about age at all, with the level all the players you just mentioned played at least season. Not to mention the Toni's of the league either.
To be perfectly honest, I'm less interested in who wins the Serie A this year than I am in whether or not AC Milan is a dumpster fire again.
Let's see your opinion on Juve and Serie A generally . Imo Juve sold better players than he bought + Buffon,Chiellini,Evra,Lichshteiner etc are far above 30... AC Milan and Inter are stronger ,so the gap is smaller than last season. Serie A can back on top scene,but step by step... Investment ,no calciopolli ,4 teams in UCL,full stadiums etc ... still 2-3 years of hard work .