Soon after my last blog post about the dearth of older characters on TV and realistic story lines for them, I interviewed Amy Lippman, creator o the YouTube show, “Ruth and Erica.” The show, which is presented in seven-minute snippets, follows 40-something Erica, played by Maura Tierney (currently also in the CBS hit “The Good Wife”), who is grappling with caring for her increasingly frail mother and father, who is in the early stages of Alzhe