Jay Leno thinks the 2001 Ferrari 550 Barchetta is aging nicely, and in this episode of “Jay Leno’s Garage,” he explains why. Unveiled at the 2000 Paris auto show, the open-top Barchetta was a limited-edition version of the Ferrari 550 Maranello coupe, and one of the last Ferraris launched before the era of smartphones and infotainment. It’s from a…