Get person's age in Ruby

Question

I\'d like to get a person\'s age from its birthday. now - birthday / 365 doesn\'t work, because some years have 366 days. I came up with the following code:

Answer 1

  def birthday(user)
    today = Date.today
    new = user.birthday.to_date.change(:year => today.year)
    user = user.birthday
    if Date.civil_to_jd(today.year, today.month, today.day) >= Date.civil_to_jd(new.year, new.month, new.day)
      age = today.year - user.year
    else
      age = (today.year - user.year) -1
    end
    age
  end