In her new book, Men Still at Work: Professionals Over Sixty and On the Job (Rowman & Littlefield Publishers), Elizabeth F. Fideler, a research fellow at BC’s Sloan Center on Aging & Work, explores the reasons why many men are continuing to work well beyond the traditional retirement age. Filled with profiles of older working men, Men Still at Work explores issues such as masculinity and the “need to provide,” as well as economic issues and job satisfaction. Fideler is also the author of Women Still at Work: Professionals Over Sixty and On the Job. Fideler will discuss her new book at the Harvard Book Store on Mar. 20 at 7 p.m.