I went to a show last year where they were going to have too many cars for the area they had and they did limit the age. Maybe 2010 or something. I dont know but there were 3 or 4 cars that did not meet the age and they let them stay. It was a pre registered deal so maybe they didnt want to tell them to leave. The dumb thing they did was award the top two awards to kit cars that I knew were a few years old