There is actually an e-magazine called The Centenarian that concentrates on that demographic. It is hard to believe but that section of the population is the fastest growing sector of the global population.
“In total numbers the United States has the most centenarians with current estimates as high as 72,000. If the population of centenarians continues to increase at its current rate of expansion there could be close to 1 million people of 100 years of age or more by 2050 residing in the US. “
There are about 450,000 people over 100 years-old worldwide right now and if current trends continue (a big if) the global population will reach 3 million by 2050. Read more