There are often 5 major circuit miles outdoors, Pre, London, Oslo, sometimes Rome, and at least one other. Yet, sub 3:50 is not often run. So, this is a very impressive result. I was absolutely wrong in predicting he wouldn't do it and would run 3:51 or high 3:50, but I have to say I was second-guessing my prediction a bit when I was reminded by the Haas article that he'd already run 3:52.01 indoors last year, that he was training at altitude for the first time, and that his mileage had risen to 100 per week. All of that, plus the ABQ and the flat track result, did suggest that he was very much ready to drop considerable time.
A sub 3:50 outdoors has happened just 61 times. Only 43 times has someone run faster than this (3:49.44) outdoors. This time has been beaten outside just 22 times since 2000. That makes it very solid. Last year, the only guys to beat this time were Kwemoi and Manangoi, and neither beat 3:49. Give it its due. For whatever reason, a poor sense of pace, not really preparing for the extra distance, mental hangups like the Algerian lion has mentioned in going from 1500m to mile, the 1500m to mile equivalents are rarely achieved. Props to Cheserek and at this point his age is irrelevant. When he was competing in high school it was. As for his age relative to other Kenyans, who can say because age cheating is so rampant?