Steve Blank: Can You Trust Any VC’s Under 40?
steveblank.com
steveblank.com
If so, I would consider him to be a counter-example.
Also, he's not a VC.
http://www.crunchbase.com/financial-organization/lowercase-c...
If I was in the market for a VC (or an investor, as he is until he gets Lowercase off the ground), he would be up there with some other investors with more years of experience, because he's been learning at a very quick pace and in a way that gives him perspective--by speaking, meeting founders, and making small investments.