Master riders older than you guys tend to prefer lower cadences. I am 66, ex. cat 3 in my past. What I find is intervals from 1 minute to 1:30 I can ride at
high cadence between 90-100. Longer threshold efforts cadence drops to 76-84. With age your cardiovascular system is weakening, cardiac output, max. H.R. On longer efforts you depend on your aerobic type 1 slow twitch fibers, so by selecting a lower cadence it puts less stress on your CV system. This is my personal experience for the older guys that might be reading this thread.
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