Whatever people may ascribe the reason for the long age in Japan  I am of the  opinion that the  world must learn from Japan how to keep the environment clean and make healthy surroundings despite the  lack of space, heavily congested colonies and heavy industrialization. Even the smallest areas have gardens, in different levels. No rocks are cut to make sculptures and food is as near to nature as possible. Herbal medicines are matter of routine and as far as I have seen allopathic hospitals also have departments of Kampo medicine or Traditional medicine. A healthy mind lives in a healthy body and healthy body needs healthy environment. Japan has worlds one of the best  Institute of Natural Medicine in true sense  and it takes human health in perspective of overall body reactions towards nature. 
 Learn from Japan that  even an area of 1 meter by one meter can be  developed into rock garden.  Bonsi technique ( i.e. to grow plants or even trees  in small pots to long period of time )  has also originated here . Their love for plants and nature bring them fresh air, fresh air cleans blood and supply of  good blood to brain makes things work better and prolongs life. 
It's lesson for the entire world that go the way of Japan where 70 percent of the area is covered with forests. The secret of life, besides simple food (almost no fried items in food) , a lot of vegetable salad and sea food and tofu, lies in pure air and clean environment. However some complained that their food has much salts and thatis why some blood pressure problems might come but  I am of the view that it's huge forested area which Japan has conserved so well despite of shortage of space, provides fresh air to its people and keeps them alive , healthy and productive  ( work wise )  for longer period of time. 

 Although it’s full of industries but one can  hardly see  pollution on the railway lines approaching big cities or colored water flowing in the rivers or drains or polythene bags flying along the railway track.
Although lots of tunnels and high speed trains and also mountain trains but the nature is kept intact that is the reason for good health and long life. 

Environment  pollution is a global issue (green house gases etc )  but it must be tackled at local level and individuals world over can't escape their responsibilities if environment has to be kept clean . 

 The scientific achievements are most laudable  and so are its forests. 

Love nature and live healthier  and longer