You know you're really getting old when...

No, I haven't bought the pitcher yet, but I was bemused by a conversation overheard while manning (womanning?) my garage sale table today.  A young boy, about 9 or 10 maybe, came up to his dad carrying a small hand held calculator. His question "What is it?" His dad's response "It's a calculator." The boy looked puzzled and I realized that the calculator he's familiar with is probably an app on his Ipad or Ipod or some other device.  If it had been an old plug in adding machine that he didn't recognize I wouldn't have been surprised, but a calculator?  How old am I???