I ran across a YouTube video of this guy a couple months ago because a popular YT fitness guy (rock climber) I watch went and interviewed him and did some physical 'age tests' with him as well as just talk about his daily routines.
He doesn't come across as batshit crazy in the video, but obviously he's a bit obsessive over this whole thing.
The funniest part about it was that Magnus (Climber) matched or exceeded him in almost all the physical 'age tests' they performed. Of course, Magnus would also outperform most other people in most physical tests but that didn't make it any less humorous. On the "not as batshit as I imagined" list, he also seemed fairly supportive/genuine of Magnus' results/abilities during the video.

So, for sure happening