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Subscribe to BBC News www.youtube.com/bbcnews Subscribe http://www.youtube.com/bbcnews Check out our website: http://www.bbc.com/news Facebook: http://www.facebook.com/bbcworldnews Twitter: http://www.twitter.com/bbcworld Instagram: http://instagram.com/bbcnews The number of people across the world over 65 years old will triple by 2050, drastically altering some countries' demographic make-up, according to a new report by the Pew Research Center. The BBC's David Botti takes a look at the numbers in this week's edition of Face Facts.