Calling definite BS on this :|
And besides, who'd want to live that long anyways?
Living indefinitely would probably end up being boring, unsatisfying, etc., however, being able to live longer, like to 500 would be wondrous to me, as it would give me the ability to spend the first 100 years working my ass off, saving up money, then use it all up exploring the entire world, do everything normal people couldn't do within their life, enjoy beauty of the world and die knowing that all you did in life wasn't simply work, sleep and enjoy the bare minimum things in life. Not everyone can startup an idea to earn millions within a few years, some people have to put up with smaller salaries.
OT: I'm currently in my first year of Med School for neuroscience, and honestly, this is the first I ever heard of anything promoting lifespan up an additional 400 years. Best I ever heard was a drug coming out in 2016 that increases lifespan on average by 15-20 years, but even that seems a little farfetched to me for a drug so miraculous going public. If I can find the name of it soon, I'll post the drug. However, with current medical technology, I have no doubt in my mind that generation lazy (all kids being born today or within past 10-15 years, yes, you are all lazy and should be grateful), or Generation Z if you wish to be called that instead, will easily surpass life expectancies of 120, maybe even 130 years.
In earlier times. Lifespans were actually much longer than that. But I highly doubt this could occur, since human lifespan is decreasing over time.
It's not as wild as people think. There's two things that halt this from happening naturally; mutations that cause diseases and the aging process. Diseases are much easier to combat. It's aging that's a problem. Essentially, your body after a long time of constantly reproducing DNA, builds up a lot of "garbage" DNA. It becomes more prevalent in the much later years of your life, and it's responsible for things like looser skin, wrinkles and the general appearance of old age. There's research going into nanotechnology right now (no this isn't sci-fi) that would literally be able to control the reproduction of the aging gene (it's already been identified which gene it is) and we could literally stop the aging gene. So theoretically, with that in check, there is no telling how long we could live. No aging and with diseases constantly being cured (although new ones do pop up because of the variety of mutations possible in the human body), this man's claim is completely possible. Nobody said it's ideal, but it is possible.
If any person in this day and age lives that long it would just spread the problems they already bring and drag them out through time rather than humanity moving on. Not everyone learns their lessons. Theres enough fiction of villains living that long to tell us that. If its real, it should be a secret kept by few. My opinion.