Coming back to this, I figured I’d take a look to see if this hypothesis is true. And it is - The changes in demand that we’re seeing also impact age, not just gender. I believe that the IM system does have a bias with respect to older men’s categories due to the Kona course, Legacy and XC slots, but I hope to show below that most of the issue for M50+ actually has to do with who is showing up.
I took a look at IMCA, and highlighted 4 age groups: M30, F30, M55 and F55, over the last 4 years. Its one location and one set of age groups, but I think it shows well enough what’s going on.
Here are the top 10 for F30 and F55 for the years 2022-2025, by finish time and position. The impact of Women’s only Kona slots has been well attested. Both of these age groups had their fastest year in 2024, though the front few positions in both women’s age groups also did well this year.
Now for the men. Here’s M30-34. Other than the top 2 positions, when we compare this year’s results we see that Kona slots do in fact impact the speed at the top of the age group - though in this case M30’s fastest year was actually in 2023 (apart from the winner this year).
For M55, the story is the opposite - this is the fastest year, though the age group winner was slower than vs 2023. Here we have 11 athletes go sub 10! Compare vs other years and you find only 2 in 2024, 5 in 2025, and non in 2022.
So what does this all mean? Well, it shows that out of these 4 age groups, M55 was the one that showed up in absolute strength. Does this mean that they should be getting 8/55 while M30 only gets 3/55 in the performance pool? Not yet…
I took a look at how these performances play out vs the 2022-2025 course record in that particular age group. Remember that the fastest M30 was this year, while the fastest M55 was 2023. For note, the fastest F30 was 2024, while the fastest F55 was also this year. Because the course records are scattered across multiple years, it does make comparison easier.
Here are the two men’s fields for this year, compared to the 2022-2025 course record:
Notably, you can se a very clear kink in the M30 performance. They’re fast up to position 3, and then fall off. Meanwhile, M55 is much deeper in terms of performance, and the 10th ranked M55 actually is faster vs the course record than the 4th place M30. As it happens, 3 of the top 55 slots in the performance pool go to this age group. The 3 guys who did well got rewarded, while 4th and beyond didn’t have the same kind of performance. Meanwhile, M55 just killed it.
So, what does this all mean? At least in these races - it shows that the depth of field in M55 was considerably deeper than the other 3 age groups that I looked at. Correspondingly, they were the AG that secured most of the slots. While I still do think that the system does favour M50+, at least here, it does show that those who got Kona slots performed best on the day.
Oh, and here’s the chart with the women added back in. Notably there’s a big gap between 2nd and 3rd in F55 (and they got 2/55 slots in the performance pool, so fair). The athlete who’s really got a case here is actually 2nd in F30 (and maybe 3rd?), who also does well proportionally vs the age group record, but is ranked 122.