As GerryV noted, vets are extremely important.
I just started reading Mike Krzyzewski's The Gold Standard: Building a World-Class Team today, and I saw a couple interesting and insightful quotes.
"I also believe that a team needs some people with experience -- veterans. Often those who have been in a particular business the longest are ignored, their contributions replaced by those of the newest up-and-comer. But it's the veterans who have the deepest level of institutional understanding and who can pass this experience on to the other memebers of your team. The veterans are also those who grasp the concept of legacy. Legacy asks the question, 'Who were you? Did you win? Did you lose? Did you do something special?' Trust me, the people who are experienced enough to ask these questions can motivate your team."
"Take the time to conduct personal interviews, face-to-face when possible."