Chicago Marathon: Number of Runners per Age Group

More than 36,000 runners proudly finished the 2010 Chicago Marathon. Of the finishers, nearly 20,000 were men, more than 16,000 were women. Here's how the 2010 Chicago Marathon finishers were distributed by age group. [Also see Average Finish Times by Age Group and our exclusive Chicago Marathon Coverage]

Women are far more represented in the younger age groups -- notably, the largest group of runners is women aged 25 to 29 --  while the men's age groups are generally equally represented in the under-40 divisions.  But the finish line doesn't ask your age, and it most impressive that hundreds of men and women over 60 are crossing the finish line each year.