well Mr Muddy, there's a good expression--"you gotta ride your own ride"
I think a lot of folks, especially those new to the game, read of someone doing x or y per day, and think, oh well I guess I can/should/can plan for what "all those people" do per day--and then overdo it, or have a physical issue, get run down, or heck, even find it fine.
btw, 83miles per day is 133km per day average, which for all of my touring years, going back about 30, is a crapload of klicks per day. Waaaaaaaaay beyond my realistic level, so there you go, even in my 20s I didnt do this, and if I had, I would have screwed my knees and been knackered all the time.....