The second U.S. masters nationals , July 3 -- 6 , 1969 , drew 200 athletes .
The second U.S. masters nationals , July 3 -- 6 , 1969 , introduced 10 - year age groups for all events .
The second U.S. masters nationals , July 3 -- 6 , 1969 , drew 200 athletes and introduced 10 - year age groups for all events .