All vehicles have to be fifteen (15) years old or olders as determined by the month and year in which the vehicle was manufactured.
http://www.tc.gc.ca/roadsafety/importation/impxus_e.htm
CBSA
Canada Border Service Agency http://www.cbsa-gc.ca/E/pub/cm/d9-1-11/d9-1-11-e.html
Embassy of Canadian http://www.canadanet.or.jp/english.shtml