Sure, you can try to stay younger by exercising, coloring your hair, and wearing stylish clothes—but how do you respond when someone asks, "Do you Twitter?" gives you simple ways to come back from over the hill and to act as young as you look. Covering everything from old-people entertainment (cancel that dinner party!) to old-people communication (it's called a "voice mail," not a "message," and no one leaves or listens to them anyway), Pamela Redmond Satran decodes the behaviors, viewpoints, and cultural touchstones that separate you from the hip young person you wish you still were. This irreverent guide is essential for anyone who doesn't want to embarrass their kids—or themselves.