If they keep an open and clear mind, lead a simple, happy life, and keep themselves busy, by the time they are 70, they might feel that they still have a lot to offer and won't want to retire.
只要保持一顆開放的心、一個清醒的腦，還有一種「簡簡單單過日子，快快樂樂找事做」的心情，說不定到了七十歲還覺得意猶未盡，不想退休呢。