Sheila Callaham writes about age ... demographic group of the world's population. In 2015, the number of people aged 100 or older was projected to be 451,000 worldwide. Today, the U.S. and Japan ...

18, Respect-for-the-Aged Day, show that those aged 80 and older for the first time represent 10 percent of the population. An estimated 36.23 million people in Japan ... the age of 65 is ...