They Asked Me What I Wanted To Be When I Grew Up. I Said ‘Happy’

Dear Quote Investigator: Did musical superstar John Lennon really tell the following story about his childhood?

When I was 5 years old, my mother always told me that happiness was the key to life. When I went to school, they asked me what I wanted to be when I grew up. I wrote down ‘happy’. They told me I didn’t understand the assignment, and I told them they didn’t understand life.

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Thanks, Andrea S