James Doohan was 42 in The Wheeler Dealers when he played the character 'Defense Attorney (uncredited)'.
That was over 60 years ago in 1963.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2005 he died aged 85, starring in 32 films in his career, 31 of those after The Wheeler Dealers was first released. If he were alive today he would be 104.
In The Wheeler Dealers, I think James Doohan looks: