Ever heard of Ed Whitlock? He routinely lays down sub 3’s and 18-19 min 5k’s. Amazing.
http://www.torontowaterfrontmarathon.com/en/news/Jul_25_05.htm
Ed is very famous within marathon community (see www.marathonguide.com).
He took the world record for 70-74 from John Keston who is a British guy living in Oregon.
I had the priviledge to stay at John’s house after the Portland Marathon (1998?). At that time John was upset because he couldn’t break 3h00 (he has done 3h00’50 " at age 71).
He broke his hip the same year mountain biking but is still running.
Did a 3h22 in 2001 (75-79) and did a 3h51 this year in the 80-84 division.
He started running in his 50s.
Good inspiration for all of us. I wish I will be running when I am 80.