RDP wrote:
Bernd Heinrich started his racing career at 40. Or a few months prior to 40. His PR at 40 was 2:22. Well into his 40's, he set quite a few records at the ultra distance. (100K, 24-Hour and 100 Mile records).
At 75, he still jumps into shorter distance trail races, and does really well at them even at 75.
No, Heinrich started early as a youngster. Read his book "Why we run".