I became a Scouter in 1976 when I aged out of Scouting. Took WB in 1983 - all of 25 years old. I was glad I waited a few years, gave me a chance to get some perspective on being a Scout Leader (much like Tom Peters' saying that no one under 30 should be allowed in a MBA program).
Fast forward to 2010, and I am contemplating taking WB21C ... why? Because I enjoyed the first class that much, and I want to see what else I can learn.
Wait? I say yes, give yourself some time to learn what Scouting is about, have some successes, and some "lessons learned" ... but never, never, never stop learnin'.