I recently asked Google to show me pictures of a grandmother. It shot back pages of kindly old women with clouds of gray hair and orthopaedic shoes. None looked like Sharline Andersen, 60, an energetic events director in Fresno, Calif., who raised four daughters while working and is now a grandmother of 12, including half a dozen step-grandkids. “I don’t see retirement as anything close to my future,” she says. “I feel like I have a lot of energy left and a lot left to give.”