Mark Rolston was 28 in Aliens when he played the character 'Pvt. Mark Drake'.
That was over 38 years ago in 1986.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 67, and has starred in 55 movies in total, 54 of those since Aliens was released.
In Aliens, I think Mark Rolston looks: