(Health & Medical Publishing Group, 2005-06) Potocnik, Felix C. V.; Janse van Rensburg, Susan; Bouwens, Christianne
By the year 2000 the total human population passed the 6 billion
mark. It is estimated to peak at 9 billion around 2070 before
declining to 8.4 billion at the end of the century. The decline will
largely be due to reduced fertility rates, improved health care and
quality of life. However, currently the proportion of elderly (i.e.
over 60 years of age) is 10%; this is expected to reach 34% by
2100.