Richard Kiel was 20 in The Phantom when he played the character 'Big Mike'.
That was over 63 years ago in 1961.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2014 he died aged 75, starring in 43 films in his career, 41 of those after The Phantom was first released. If he were alive today he would be 84.
In The Phantom, I think Richard Kiel looks: