Updated: Sat, 03 Aug 2013 12:00:00 GMT | By Jackie Burns
Forever 21: Celebrities as they came of age

Sir Paul McCartney

Sir Paul McCartney (© Rex Features)
  • Cameron Diaz (© Rex Features)
  • Reese Witherspoon (© Rex Features)
  • Christian Bale (© Rex Features)
  • Alyssa Milano (© Rex Features)
  • Justin Timberlake (© Rex Features)
  • John Cusack (© Rex Features)
  • Sir Paul McCartney (© Rex Features)
  • Michelle Williams (© Rex Features)
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Age Now: 71

Life at 21: Pesky tweens may have taken to Twitter last year to ponder the identity of the old guy crashing the Grammy’s, but when Sir Paul McCartney was 21 years old, the Beatles’ rocker couldn’t go anywhere without being mobbed.