As an older person, you may find yourself singing in unison with your partner or friends when you hear something that reminds you of a particular song.

 Just think how many songs you’ve heard during your life! You have plenty of source material and memories that link to it.

 Usually you can just sing a line or two, though — who can remember all the lyrics or the entire tune? But it's enough to bring back happy memories, which makes it worthwhile, even if people around you cringe.

 My maternal grandparents, whom I loved dearly, did this. Then I snickered. Now I sing.