The average life expectancy for men in the UK is 79 years old, while for women 
  it is 82 years old. In some parts of the world, such as Japan, the gap is 
  even larger, with women living on average nearly six years longer. 
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There have been a number of theories for why this may be, including a recent 
  finding that the tiny &ldquo;power cells&rdquo; that produce energy for their cells <a href="http://www.telegraph.co.uk/health/healthnews/9448608/Why-women-live-longer-