Lippi isn't that old for not coaching the team for three seasons or more, a thing which can guarantee a stability in the squad. This isn't my first time to say it, but when comparing Lippi to either Ferguson or Capello, we'll realise that he is capable of doing his job perfectly for not less than 5 more seasons to come.
Ferguson is 65, Capello is 61 and Lippi is 59. I know that Mourinho is much younger than all of them, but stability means at least three successive years on a team's bench, in my opinion. And yes Mourinho is simply a good option, but not the best one to guarantee us a stable era. Maybe we can argue about who is more motivated. Lippi already won the world cup and he did everything with Juventus during his two spells in Turin. But, Mourinho is a young talented tactician who is enthusiastic to win and prove himself more.
I can't deny that I wish I'll see the latter on Juve's bench someday. Yet, I still have all faith in Marcello Lippi.