63 - time to retire? No way!
I'm 64, and started a new (and hope long-term) position with a major tech company as senior systems engineer at the beginning of this year. I'm certainly not ready to retire! If Chambers thinks he is ready to retire, then he is, but it should be HIS decision! If he leave Cisco, then it should be because he is ready for some new challenges, and NOT because he is "too old" for the position!