I just listened to a bunch of callers to a radio show, which dealt with the recent passing of a law that out-laws forced retirement. A guy can now keep his job past 65 if he wants to and is able. What I found interesting, was the polarity between opinions. On one end of the spectrum, young callers wanted the old guard to make room for them. On the other end, people suggested that experience is a good thing to have in a business. Being who I am, I immediately thought of a guy taking a swig of his Malox bottle and gumming his microphone: "This is your captain speaking, I think....let's get this box in the air, because it is time for my nap."
My wife thinks that old doctors are great at "I have seen this before", but that new doctors are better informed of new methods to threat those problems. ( I vote for keeping them both.)
New engineers, like my neighbour, apply new materials, the old guys still use rivets..(so to speak)
Nothing compares to an experienced hand using a scraper or fitting a dove-tail. (