I was a kid. In my mind, Zeppelin will always equal “Zeppelin circa 1971 or ’72.” It’s like a stationary monument that lies along the path of my life. Listening to Pearl Jam, however, makes me feel older than listening to Zeppelin does. That’s because that band is traveling down the path with me. Led Zeppelin will always exist outside of time, whereas Pearl Jam will always exist in my time.