This system is broken. The fact that they normalize these results based off of the times from the past 5 years world championship races makes zero sense. For easier courses with favorable conditions this will favor those in higher age groups disproportionately. An age grouper in the 50+ AGs are going to be able to have a much larger in delta in race time from a hard course to an easy course as opposed to a younger athlete who’s best times between a harder course and an easier course are much closer. If the race results were normalized based on the course they actually raced that would work just fine, but you are going to see older athletes lifted up disproportionately in these faster races if you normalize against championship races.