One of the easiest ways to make yourself feel old is to use an expression from your childhood and watch your children's faces turn blank. If you joke that someone chatty was "vaccinated with a phonograph needle" odds are nobody will laugh, and if you say "let's get down to brass tacks" they'll have no idea what you mean.But not all phrases go out of style just because they're uncool. Some are related to technology that nobody uses anymore, while others have really obscure meanings. See if you recognize the meanings of every expression on this list!1. Rewind