He's being downvoted because it's not true. The oldest person on record was 122. If there were a bunch of Tibetan monks walking around at 120+ we'd know about it.
Many eastern tibetan monks claim to be 120+ years old. Due to the nature of their lives its very hard to document birth to death. Of course people deny it because its not "on record." likely due to longevity bias that humans naturally have.
There's true, false, not proven. It (claim to be 120+ years old) is not proven. Necessarily, it's not true. If it becomes true in the future, the studies would be interesting. That's obvious. Basing any sort of continued argument or worse, research, on wishful thinking is something left up to you.
https://www.thetimes.co.uk/article/a-foolproof-anti-cancer-d...