SusanMN hit the nail on the head. There were a lot of old timers who realised that our currency was basically turning from money into not-money. All their lives, they had always used precious metal coins as currency. In 1965, that changed and, for a few years, everyone was intentionally pulling the silver coins out of circulation. In the 60's, the mints actually had to make extra runs because people were squirreling away all the desired coins, leaving many fewer in circulation. So, basically, after the early 60's, nobody was walking around with silver coins in their pockets anymore. People still today have quarters in their pockets from 1970, but not 1960.