I think we can all agree that pain and discomfort are subjective. All I know is I have to get off the bike about five minutes for every hour I ride no matter if it is an easy beach ride or climbing in the mountains. I'm 54 with a bunch of old injuries that become aggravated with fatigue, pressure points and cold weather.
Road cycling helps me to manage those old injuries and keep a level of fitness. Biofreeze is my friend. The question for me is am I intelligently managing my pain in preparation, while cycling and post-ride?
I am thankful to be able to ride with some discomfort and at times pain. My g/f suffers from chronic migraines and does not have the luxury to ride.