I believe in Europe you ride your "era" For example, i was born in 1970, my "era" of riding was the 80,s. If you were born in 1955, your teenage "era" would be say 1965 to 1975!!! I,am forty, i don't even know if yamaha made a yz in 1940, and i bet there would not be many eighty year olds that could even start a YZ 490.