https://www.unexplainable.net/info-theories/mahavatar-babaji...
But really, you might think living a 1000 years is extraordinary, however, the soul (or the life we have in each of us, including you and me) is immortal. When we die, it's simply the body that is discarded. But life itself never perishes. The soul takes multiple births in new bodies and this process of life and death goes on and on until the soul merges with the supreme conciousness. So what's the proof for all this? Well, there's nothing to prove it as false either.
Modern science disregards things that it cannot experience and "see the proof of" for itself. But that's like a person who lacks sensual perceptions saying stimuli that interacts with their senses does not exist. For example, if a blind person says light does not exist or a deaf person says sound does not exist. They might even deny its existence despite you telling them otherwise, that's because they cannot experience it for themselves. So who's to blame them?
Similarly, we are kept from higher understanding due to our inability to experience. That does not mean it does not exist. It simply means we are incapable.
There are many fantastic things in this universe that science knows it cannot understand and even more things that science does not even know exist.