"Peter Pan Syndrome", as I learned just now, is the urge to stretch adolescence into mid-life. (Scientists call it psychological neoteny.) Hmmm ... I can identify with that. So it was with great interest that I saw the formula for diagnosing Peter Pan Syndrome in the new Outside issue. Diagnose yourself!
((annual salary in thousands) /(age - career changes))
(years in current profession + mortgages + marriages + children)
The answer is the age you're acting like. Seems to be around right for me -- my answer was 34, and that feels about the age I'm acting! So it appears I've got a little Peter Pan Syndrome. No surprise there ...