Robert De Niro was 21 in Three Rooms in Manhattan when he played the character 'Client at the Diner (uncredited)'.
That was over 59 years ago in 1965.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 80, and has starred in 175 movies in total, 166 of those since Three Rooms in Manhattan was released.
In Three Rooms in Manhattan, I think Robert De Niro looks: