Mike Myers was 21 in John and Yoko: A Love Story when he played the character 'Delivery Boy (uncredited)'.
That was over 38 years ago in 1985.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 60, and has starred in 66 movies in total, 63 of those since John and Yoko: A Love Story was released.
In John and Yoko: A Love Story, I think Mike Myers looks: