How much longer could Lennox have reigned?

i agree absolutely 100% and even more

 

Firstly, he would have to beat Vitali again, and then probably a resurgent Wladimir sometime to have a legitimate reign extended .... meanwhile he's declining physically even if he remains focused mentality (a big if).
If he can lose at 35 to Hasim Rahman, he could definitely slip up against a Brewster, a S.Peter, or get befuddled by Byrd or Ruiz at 40+

 

Well he lost to Mcall at 30 too. As I said if he remained focused and trained prepared correctly for those fights I cant see him losing to either Klitschko, he was just too complete a fighter. I think where he might have problems is a guy like Byrd or Ruiz, but they were pretty much washed up themselves after Lewis fought Vitali.

 

This is 100% correct and the reason Lewis hung them up because hes a smart man. I think physically Lewis still had the skills because of his clean living, but once you are mentally no longer in the ring your days are numbered.