Yeah, maybe the only possible way to live that long is to live on a secluded island with pure air, water and organic food, without wars, stress and worries of the modern world. But in that case why live 100+ years if life goes past you?
It is also not conducive to longevity. Michael Jackson slept in a hyperbaric chamber and he led a pretty decent life, take care of yourself, but it did not help him to live long. On the other hand there are homeless people who live 80+
Yes, some homeless people can live for a rather long time. It all depends on each person, all the organisms are different and they need different conditions for a normal existence.