An 85-year-old man was holding a cassette in his hands that had been lost for years. On it is his late mother singing a song for him.  The voice is one of the first things to forget about someone who has passed away. Their appearance remains in the memory for a long time, but at some point you can no longer “hear” them. This is particularly tragic for the elderly, who often only have photos and no videos of loved ones as memories.