Kevin Costner was 24 in Malibu Hot Summer when he played the character 'John Logan'.
That was over 43 years ago in 1981.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 68, and has starred in 88 movies in total, 86 of those since Malibu Hot Summer was released.
In Malibu Hot Summer, I think Kevin Costner looks: