Keanu Reeves was 19 in Letting Go when he played the character 'Stereo Teen #1'.
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 59, and has starred in 125 movies in total, 122 of those since Letting Go was released.
In Letting Go, I think Keanu Reeves looks: