[pdf] UN Report - World Population Prospects, The 2015 Revision

The United Nations Population Division has published a 66 page report document estimating and projecting levels of population and trends for all the countries of the world, as of 2015. Recommended research for reading, here is the download link.

Much interesting information is available in this free report. Key findings are that the world population is aging in most countries and that average life expectancy is increasing in the coming years.