Older Entrepreneurs Better Than Young Ones 

From Instapundit.

“I came away from that meeting, and many that followed, convinced that not only were these older entrepreneurs equal to their younger counterparts in passion and commitment, but when it came to interpersonal skills, business experience and networking they were clearly superior. . . . While young entrepreneurs enjoy an obvious edge when it comes to energy, health and irrepressible optimism, much of that advantage is dissipated on endless searches for connections and capital, unrealistic product dead-ends and on-the-job training.”

I'd bet it applies to most jobs, not just entreprenuers.