Greetings and hope most enjoy this holiday time!
Perhaps the topic below will be of interest for some.
I looked at the Master Athletics AG 2022 calculator recently (that is tougher than e.g. the USATF MLDR 2020 calculator) and found that for the same AG % the ratio 10K_time/5K_time is considerably higher.
I was always interested in defining this ratio for elite runners and undertook a small and shallow study. Selected only those who seriously competed at the world top level with 5K PBs under 13 min and 10k under 27 min. Thus, guys like Legese, Geremew, Kimmeto, Cherono and many others are not present because they were/are focused on the M and HM only. For the same reason El G and Jacob Ing. are not present (they do not have 10K results under 27).
PB_10K/PB_5K:
Barega (Tokyo Olys 10K gold) – 2.10
Kejelcha (Tokyo Olys podium) – 2.10
Ahmed (Tokyo Olys podium) – 2.112
Kipchoge – 2.097 (early and mid 00’s, before his M-era)
Bekele – 2.087 (early and mid 00’s)
Gebreselassie – 2.086 (during his 5K/10K times)
Cheptegei – 2.081
Kiplimo – 2.074
Kimeli -2.10
Rupp – 2.053
Now, to the AG calculators.
USATF MLDR 2020 calculator
For M63 and 85% ("my numbers") it returns 19:10/5K and 39:15/10K, thus the ratio is 2.047 and it surprised me a lot.
This calculator really admits that old geezers are dying slower than G.O.A.T.s, ha-ha. Even Rupp who is likely the most “universal soldier” (showing great results from 5K though full M) is slightly above this bar.
Master Athletics AG 2022 is much more demanding as far as absolute times are concerned, and for M63 85% it requires 18:41/5K and 38:47/10K. However, the ratio is somewhat relaxed vs. the previous one - 2.076. Nevertheless, still tougher than for G.O.A.T.s. I find it strange.
Another strange thing is that my own ratio is currently 2.09, while I was sure that with my very low mileage 10K was/is way out of my capability as compared with 5K. But this number is well within the above listed.
Does it mean that training for 5K and 10K is not so much different? Keep thinking.