Why Japanese look younger, live longer

ONLY in JAPAN -- Nov 14
Every Centenarian I talk to, people who are over 100 years old, tell me one of the things to a long life is visiting a Japanese hot spring or onsen regularly.
It's one of many things but I wanted to know why and how hot springs can not only make us look and feel younger but help us live longer. I traveled to Nakanosawa Onsen, Tsurunoyu Onsen and Tamagawa Onsen to look at how special the waters are, geothermal heated spring water full of natural chemical compounds and minerals. Is there more to it than just soaking in a bath? - ONLY in JAPAN