a wise old saying

There's an old saying that goes "Don't switch horses in mid-stream."  A modern version might be "Don't change numeric catagories in mid-sentence."  I know it's not as catchy, but a young reporter on this evening's news should listen to my advice.  While introducing a man who has been active in "Toys for Tots." an admirable charity, by the way, the reporter said that this gentleman had been involved with the charity "for the last (and here he fumbled a little) 30 decades."  Really?? He looked awfully good for 300+ years old.  Happily, the anchor man worked '30 years' into his final wrap up, just in case any of us were really confused.