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I was this old on

MY_BIRTHDAY = Date.new(1982,5,24)

  def years_old_on(adate)
    (adate - MY_BIRTHDAY).to_i/365
  end

hint: pass it a date object, and set MY_BIRTHDAY to your birthday.
e.g.:

years_old_on(Date.new(1993,7,6)) #=> 11

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