BY JONATHAN VALANIA “Comedians are the new philosophers,” the girl next to me whispered in my ear conspiratorially, like this had just occurred to her for the first time — at 24, she was roughly half the median age of the crowd at the Academy of Music Friday night where Jerry Seinfeld was staging a two-night/four-show big-ticket stand, endeavoring to put the lie to F. Scott Fitzgerald’s dictum that there are no second acts in American lives. I just shrugged and thought: Maybe back in the day. Lenny Bruce, George Carlin, Richard Pryor, Bill Hicks — those guys were philosopher […]