Charles Grodin was 18 in 20,000 Leagues Under the Sea when he played the character 'Drummer Boy (uncredited)'.
That was over 69 years ago in 1954.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2021 he died aged 86, starring in 52 films in his career, 52 of those after 20,000 Leagues Under the Sea was first released. If he were alive today he would be 89.
In 20,000 Leagues Under the Sea, I think Charles Grodin looks: