The Iditarod Trail Sled Dog Race is an annual long-distance sled dog race run in early March from Anchorage to Nome, entirely within the US state of Alaska. Mushers and a team of 16 dogs, of which at least 5 must be on the towline at the finish line, cover the distance in 8–15 days or more. The Iditarod began in 1973 as an event to test the best sled dog mushers and teams but evolved into today's highly competitive race. Then a record, the second fastest winning time was recorded in 2016 by Dallas Seavey with a time of 8 days, 11 hours, 20 minutes, and 16 seconds. As of 2012, Dallas Seavey was also the youngest musher to win the race at the age of 25. In 2017, at the age of 57, Dallas's father, Mitch Seavey, is the oldest and fastest person ever to win the race, crossing the line in Nome in 8 days, 3 hours, 40 minutes and 13 seconds. Dallas finished second, two hours and 44 minutes behind.