StackOverflow Data Illustrates Why I Prefer Hiring Experienced Developers
scottporad.com
scottporad.com
I think there's a balance. Young hackers have amazing energy and still-empty lives (no mortgage, kids, etc). They truly enjoy coding for long stretches, reading about coding in their off time, etc. They also tend to be fearless learners. When was the last time you saw a 45 year old pick up a new instrument? Younger folks are more willing to jump on new technologies. That's powerful.
As you say, older folks are more efficient. But perhaps the wisdom they've gained makes them more powerful in lead dev/management roles where they can apply that wisdom to a larger group of younger rockstars.
Maybe young folks are more inquisitive individuals.
Masters teach journeymen, journeymen become masters.
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> The junior developers ask more questions. This means they know less (which is why they ask).
I dare say they "know less", but this doesn't necessarily mean they are less expert. Junior developers might be more experimental, more curious, and more willing to actually ask questions―and these are all very desirable traits in a developer.
"You can't teach an old dog new tricks."
[1] http://coding-and-more.blogspot.com/2011/06/its-official-dev...
P.S. also, I don't think you'll be hiring your devs to answer questions all day long on an internet message board? So Stackoverflow statistics are useless.