Ok, I found the source. Runblogrun.com and Larry Eder:
"On May 6, 1954, at the Iffley Road Track at Oxford University, Roger Bannister, paced by Chris Brasher and Chris Chataway, became the first man to break four minutes for the mile, with his time of 3:59.4.
In 2013, 59 years later, there are 400 Americans who have now broken 4 minutes (Robbie Andrews as 400th, Don Bowden was first American, in 1957), and approximately 1600 men who have broken the four minute mile. Sir Roger Bannister was the first man to do the feat, and in his mid-80s, remains one of athletics great ones. #subfourmile, #bringbackthemile"