"The United Nations released population projections to the year 2050 that
ranged from 7.3 billion to 14.4 billion."
Source: Edward O. Wilson, Harvard University
"The average age of a world citizen is now [only] 28 years. Only 9 per cent of the [world] population is over 60 years, while 32 per cent are under 15."
Source: Club of Rome