There are some identified populations around the globe in which various lifestyle markers are associated with significantly longer lifespans.
The two that come my mind immediately are: the Okinawans of southern Japan and the Seventh-Day Adventists of Loma Linda, California.
The longevity itself tends to be associated with factors such as: meaningful lifelong participation in a social community, vegetarian or vegetarian hybrid dietary patterns, gentle, regular exercise, and so on.
The typical life-expectancies were in the centenarian range. That’s most of what I’m vaguely familiar with as far as empirical data on this topic.
I do know that there is a long and developed tradition of Tibetan medicine, and I think it’s unlikely that people there live without any such resources. Maybe you were referring not to medicine in general but to ‘modern Western allopathic medicine’ or something like that?
I know that Tibetan medicine in part focuses on the cultivation and care of what they call ‘rlung’ or life energy, somewhat similar to the concept of qi in Chinese medicine or prana in Ayurvedic. It’s likely that they’ve tried their own experiments with managing disease and extending the healthy lifespan.
It is true also that the stress and congestion of modern lifestyles is associated with a range of novel health concerns. But I don’t see evidence that the removal of blockages would instantly lead to radically extended lifespans. Our fossil record, and archeological/anthropological data on our ancient ancestors and near-human ancestors doesn’t support it.
On the other hand, there have been and will always be outliers. And it’s possible that by studying such people we could glean principles that could benefit the majority of humanity as well.
Anyway, them’s my 'pinions.