Short answers, pulled from the story.
George Harrison changed the lyrics to serve as a personal tribute after John Lennon was murdered in December 1980. The original version featured Ringo Starr on vocals but was rejected because Starr felt the vocal range was too high and disliked the initial words.
Harrison and Starr recorded the song between the 19th of November and the 25th of November 1980. Paul McCartney, Linda McCartney, and Denny Laine later visited Friar Park to record backing vocals during this same timeframe.
The lineup included Al Kooper on electric piano, Herbie Flowers on bass, Ray Cooper on tambourine, and Ringo Starr on drums. Paul McCartney, Linda McCartney, and Denny Laine provided backing vocals as an overdub to the original track.
All Those Years Ago spent three weeks at number 2 on the US Billboard Hot 100 behind Bette Davis Eyes by Kim Carnes. It peaked at number 13 on the UK Singles Chart while topping Canada's RPM singles chart and spending one week at number 1 on Billboards Adult Contemporary listings.
The music video features a slide show presentation of stills and short archival video clips emphasizing John Lennon and George Harrison. This visual approach highlighted the passage of time since their band days ended without showing new performance footage.