Danny Nucci was 15 in Explorers when he played the character 'Nasty Kid at School'.
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 55, and has starred in 37 movies in total, 37 of those since Explorers was released.
In Explorers, I think Danny Nucci looks: