7 years. By the time you are 7 yrs old, there's not a single
  cell in your body that is the same as it was when you were born.
  14 21 #science
  [vine id = "M57jQ1EUJgd"]
  7 years. By the time you are 7 yrs old, there's not a single
  cell in your body that is the same as it was when you were born.
  14 21 #science

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