The size of the worlds aging population is a combination of population growth and life expectancy. In developed countries, population growth is minimal. In fact, it is expected that the total population in developed countries will decrease by 1% between 2000 and 2050 (from 1.19 billion to 1.18 billion people), whereas the population in developing countries will increase by 67% during the same period (from 4.87 billion to 8.14 billion). At the same time, people older than 65 years in developed countries will increase by 86% (in a population falling by 1%), whereas in developing countries the increase will be 459% (in a population growing by 67%).
Due to demographics with a rapid population growth and an unprecedented urbanization rate during the 1960s, 70s, and 80s, the aging population is now increasing rapidly, with the consequence of an explosion of patients requiring medical care for medical conditions related to an aging population. According to the World Health Organization, cancer will soon reach epidemic proportions, causing up to 10 million deaths per year by 2020. Yet at least 1/3 of all cancers are preventable, and a further 1/3 of cases can be effectively treated if detected early.