IN OUR ANNUAL Fabulous at Every Age issue, we pay tribute to the stylish, inspirational, and fearless women who regularly grace the magazine’s pages. Our cover star, Jennifer Lopez, certainly embodies these virtues, and then some. The thing I’ve always admired most about J. Lo—apart from her stunning beauty—is her rock-solid work ethic. How else to explain the superstar’s willingness to attempt a tightrope walk for our cover shoot? She practiced over and over until she perfected her step, proving once again that through sheer determination she was able to make the impossible possible (and, yes, that includes defying gravity). The high-flying antics didn’t stop there. For the subscriber cover, we asked photographer Mariano Vivanco to find inspiration in Ryan McGinley’s showstopping image of the brilliant rapper M.I.A. swinging above…