Not An Expert wrote:
3) Marathons today are largely participation events: the average male time in '07 was 4:29:52, and the average female time was 4:59:28. That's pretty darn slow (although the medians would likely be a bit faster, and would be a better statistic to look at). I would be interested to see what average times were in the '70s.
Purely anecdotal:
My first marathon was in 1972 ("pre-Shorter"--though actually after his big Fukuoka win in 1971). I ran 3:56 and beat the last finisher by 10 seconds. Total field a few dozen, at least 2/3 of finishers under 3:30.
My second (and last) marathon was a few months later--the national championship. Ran 3:50 on (almost) the first hot day of the spring and doubt that I beat more than 20 other finishers. (Actually probably more like 10, and I'm not sure there were any finishers over 4:00. Total field size under 200, including the most women I ever raced against: 4.
From those experiences, I'm not sure but certainly think the median (men's) time was under 3:30 in those days, though probably well over 3:00. There weren't too many joke "runners" then, particularly after Boston established qualifying standards. I was considered only semi-serious, as I had no talent and averaged not much more than 50mpw.
Since then I've walked the marathon distance, multiple times, under five hours. For "runners," even those as untalented as I, to take five hours and more to complete a marathon just boggles my mind.
Oh yeah, and back then races followed IAAF rules: no water stops before 10km, and only every 5km thereafter.