alt Hacker NewsDay in day out, everyday in public transit, just sheer noise would not add any lifetime. We stayed at our Japanese friend’s house so we did have exposure to their everyday life. The point I want to make is that many things contribute to a long life, and of course Japanese people are doing most of those things right, regardless of what that might be. I remember watching a documentary about Okinawa people. One thing they mentioned was laughter.
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I grew up in Germany. For the past 13 years, I've lived in the US. Oh, how I wish I could go back to the "day in day out, everyday in public transit" instead of this car hell. In Germany, just like in Japan, I didn't feel that it was noisy at all. It was clean and quiet and soothing, I could just sit there and relax. Everyone takes public transport, across all income ranges.
As a result, public life itself is more quiet and soothing, because you are not constantly surrounded by cars, even if just sitting outside a café.
As for the family you stayed at, they must eat differently from the Japanese families I know personally. Studies agree: https://www.livescience.com/54133-japanese-diet-longer-life.... https://chns.cpc.unc.edu/resources/publications/bib/2884/
Japanese public transport is insanely quiet! No talking, no phones ringing... It's my happy place.