With a long weekend upon us, ConvergEx’s Nick Colas takes the opportunity to wax a bit philosophical. The question for the day: “How do you survive middle age while working on Wall Street?” After polling a few friends of a similar vintage to his own 25 year history on the Street, he has come up with a Top 10 list of dos and don’ts. At the top of the list is “Don’t get stale” – what you did to become successful is not necessarily what will keep you competitive. Other dictums include “Be efficient”, “stay in touch with your clients”, and “the answers are never ju