Nobody will beat this
December 17 happens to be the birthday of a sizable contingent of notable runners.
Peter Snell (b. 1938) -- three Olympic golds, five WRs, 1:44.3 800m on a grass track)
Tatyana Kazankina (b. 1951) -- three Olympic golds, one WR, first woman under 4:00 for 1,500m (her 3:52.47 PR from 1980 remains a European record). Known doper, in case her Soviet nationality and the historical eras weren't dead giveaways.
Paula Radcliffe (b. 1973) -- two road WRs (10K and marathon, the latter still standing), three World Cross-Country Championship gold medals, 2004 and 2008 Olympian
David Rudisha (b. 1988) -- two Olympic golds, one WR (800m, 1:40.91, still standing)
Marc Davis (b. 1969) -- 1986 Kinney (now Foot Locker) national champion, American 5K road record, 1996 Olympian
Kevin Beck (b. 1969) -- Setter of numerous course records in New Hampshire and Massachusetts. 1984 Blue Dukes 2-Mile Road Race champion (12:38).
Although Davis was apparently born on the same date I was, he graduated from high school in 1987, a year earlier than I did. This means that when he placed 8th at Kinney Nationals as a junior, he was still only 15 years old.