Interviewing Experienced IT People?
I have a different view. I'm 46 and have been doing networking since Corvus. I still know how to use a freq counter, signal injector, scope, and soldering iron. I'm a beat up old net/sys admin, former OS/2 evangelist, and current rabid linux user.
I feel sorry for a lot of these kids coming into the industry today. It is easier to keep up than catch up. The depth and breadth of experience is a hard beast to defeat. Solutions are most often found quickly by those who've seen enough to jump confidently.
I've had interviewees with all the certs, but had no idea what "righty tighty lefty loosy" meant. Common sense and hand skill are horribly lacking.
I suppose what it comes down to for me is that it's not how smart you are, or whether or not you've been educated properly, but how you think. Troubleshooting skill is more a way of thinking than anything else, and there is no substitute for experience when it comes to putting out fires.