How to stay pertinent. How to keep healthy, wise, and on top. Last night one of my all-time hero(ine)s, “7 of 9,” a Barbie-doll escapee of the Borg collective in the Capt Jean Luc version of Star Trek, played a top-of-the-game, military-corporate arms contractor. Every bit the same ravishing physical specimen she was 20 years…