Ms. Magazine founding editor Suzanne Braun Levine this week talks to the magazine’s Andrea Sachs about her book 50 is the New Fifty. Braun Levine articulates The New Menopause as fearlessly as she has for years, telling Sachs that “when I traveled around talking about ‘second adulthood,’ and people would say to me, ‘Oh, I get it. Fifty is the…