George Takei was 21 in Gigantis: The Fire Monster when he played the character 'Commander of Landing Craft Ikeda (voice)'.
That was over 65 years ago in 1959.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 87, and has starred in 96 movies in total, 94 of those since Gigantis: The Fire Monster was released.
In Gigantis: The Fire Monster, I think George Takei looks: