In Japan there are more than 66,000 Centenarians, in a population of about 125 million– which is .05% of the population. 

In the UK there are 14,400 Centenarians in a population of 66 million. That’s .02% of the population.

In Canada there are 8,200 Centenarians in a population of 36 million.  That’s .02% of the population

Japan must be the greatest country in the world to grow old, and in fact has the oldest citizenry. Japan has TWO AND A HALF times the percentage of Centarians as the UK or Canada.   

Why is that? You could do worse than listen to this half hour BBC podcast Japan: New Ways to Grow Old