Jeff Conaway in ‘Grease’
Let’s be honest, all of the actors playing our favorite Rydell High students would be right at home on this list, but a couple of them stand above the rest. One of those is Jeff Conaway, who played the T-Birds’ resident street racer Kenickie. Conaway was going on 28 when “Grease” premiered in 1978, but his forehead lines made him look even older. Conaway isn’t even the movie’s worst offender, though. That honor goes to…