It just follows the UCI masters age grouping which is done in 5 yr bands all the way up. 30-34 is in fact no longer a category which you can race at World Masters (but British National Masters have it), but the records are still retained.
Ok thanks for that. I was thinking what is the competitive need to separate those two bands? Some people will be quicker at 33 than36 but others the opposite!
It just follows the UCI masters age grouping which is done in 5 yr bands all the way up. 30-34 is in fact no longer a category which you can race at World Masters (but British National Masters have it), but the records are still retained.