To his credit, John C. Dvorak held off on the insults until Day One. Over at PCMag he wrote a pathetic hatchet job discrediting Mayer because she is young, looks young and is a Yahoo! outsider. Then, accompanied by little substance to support his claim, he argued that "100 resentful Yahoo! executives" will stab Mayer in the back before she has a chance.

He ends his out-of-touch tirade by linking to a tweet he sent Mayer saying: "@marissamayer Congratulations AND good luck. You are going to need it." He noted that he never heard back from her. John: It never pays to be rude. Plus, it's not that you're 60 years old; your attitude makes you sound older. This is not the Silicon Valley you grew up covering.

In 2007, Dvorak, then at MarketWatch, said that "Apple should pull the plug on the iPhone." Then, in PCMag circa 2010, in a classic example of making the same mistake twice, he predicted iPad would be a "good for nothing ... flop."

Just because Yahoo! has been a disaster does not mean we should brand Mayer one until she proves otherwise.

A Bold Move Brings New Blood

Quite the contrary, YHOO becomes a buy because the company made the bold move. Other tech companies pass "seasoned executives" back and forth to fill CEO jobs. That will not end well in a world defined by brands of the young, such as Google ( GOOG), Facebook ( FB) and Apple ( AAPL).

Young, fresh blood represents the future of the tech, Internet and new-media space, not the tired old status quo that guys who have been covering the beat for decades find routine comfort in.

But it's not even about the number that represents your age. It's about how you approach the business. Visionaries like Steve Jobs, who died at age 56, Jeff Bezos, 48, at ( AMZN), Mark Pincus, 46, at Zynga ( ZNGA) and Tim Westergren, 46, at Pandora ( P) are ageless.

The latter three -- and others like them -- will carry the entrepreneurial torch for Jobs. This group, which Mayer could very well end up part of someday, will run circles around people with outdated mindsets, regardless of their dates of birth.

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