It's a birthday tradition: Every year since he was 12, Dave McGillivray has run as many miles as his years; now, he's up to 60.

When Dave McGillivray turned 12, he ran 12 miles almost accidentally to celebrate his birthday. Now, 48 years later, he just ran 60 to celebrate his 60th. Now the race director for the Boston Marathon, McGillivray isn't sure how long he can keep it up, but he shows no signs of stopping. My story for ESPN.com's Endurance Sports section: http://espn.go.com/sports/endurance/story/_/id/11339792/endurance-sports-boston-marathon-race-director-dave-mcgillivray-keeping-birthday-runs-alive-age-60