We were in an antique store when my kid runs up to me and says, "They have one of those phones with the round thing on it! Show me how it works!" I suddenly felt ancient. Those moments happen more and more often these days. My dentist, with his white hair and his decades of experience, mentioned how old he was when Star Wars first came out and revealed he is much younger than I am.
Cracked collected image macros from their readers that illustrate 26 of those moments that remind you of how much time has passed since you were young. I'm sure you'll relate to at least a couple of them.