Woody Harrelson was 15 in Harper Valley P.T.A. when he played the character 'Extra (uncredited)'.
That was over 46 years ago in 1978.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 62, and has starred in 128 movies in total, 123 of those since Harper Valley P.T.A. was released.
In Harper Valley P.T.A., I think Woody Harrelson looks: