Laurent,
My guess is the masters records are not maintained because of the volume of work required. In the US, Ryan Lamppa at the Road Running Information Center in Santa Barbara has the enormous task of gathering results from road races throughout the US. He maintains the records for Open and Masters groups. A week ago he submitted 90 pending records for ratification at the USATF National meeting later this year. Of that group, 80 are pending masters long distance running records.
2005 pending US LDR records
Athletics Canada may not have the same volume, but it's still a big task to validate courses, check the timing, proof of age, etc. Maybe, we can find someone that can tackle both US and Canadian LDR records. -- Justin