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Age grading is interesting for sure and I think everyone ages differently so some people spike late, some excel early. For me even if I'd started at 15 or 16 and had great coaching (like Lydiard) at the time I don't think I'd have been anywhere near or under 14:00 for 5000, but somehow--clean living, altitude, and xc skiing and some dumb luck--I haven't slowed much or at all in 15 years.
I dare say you are an outlier. To not slow down between 45-60 is quite unusual. I think most of us do slow down at a rate consistent with the age-grading tables. I'd be curious to see if other 90th percentile athletes experience what you have done. I hit close to 90% on the sprints, and the age-graded times are still consistent for me (though I've only been doing 100m and 200m for 15 years or so).If you are running close to the same times you were 15 years ago, I am sure your WAVA %'s are skyrocketing. You don't think with great coaching, clean living, altitude, xc skiing and luck you couldn't come close to 14:00 as a 27 year old? I bet you could've. No way to prove this.
Nice graphic - next we can put in the top 5 or 6 age grade scores for each age group and have confidence intervals. Give radial and our friends on the other side a lil' lesson on stats!