As of 2015, which country has the highest population of people aged 100 years or older?
Correct answer: United States

McGiff
As a percentage of total population Japan would be miles ahead, given the size of the population of the US, I suppose I can see how they have the most.

Republic of China
They should add some facts :
A supercentenarian (sometimes hyphenated as super-centenarian) is a person who has reached the age of 110 years. This age is achieved by about one in 1,000 centenarians.[1] Supercentenarians typically live a life free of major age-related diseases until shortly before the maximum human lifespan is reached.[2][3]

Alexander
sorry wrong JapAn and Italy

sree sravani
as a percentage of total is japan

kikomo
not with the price of healthcare I call this a lie