Good questions!
My experience (58 year old) is that I have to dial back VO2max interval generally with 3 to 4% and the real mean ones with even more.
Endurance, threshold and even over-unders are pretty much manageable with my tested FTP. Another experience is that I prefer the 20 minutes FTP test over the Ramp test. I get constantly lower values for the Ramp test to the point that it might even become a mental issue. Cheers.
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