Josh Brolin was 16 in The Making of 'The Goonies' when he played the character 'Himself'.
That was over 39 years ago in 1985.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 56, and has starred in 71 movies in total, 68 of those since The Making of 'The Goonies' was released.
In The Making of 'The Goonies', I think Josh Brolin looks: