def age
      list = txns
      list.empty? ? 0 : (Time.now - list.min_by(&:date).date) / (60 * 60)
    end
def age
      list = txns
      list.empty? ? 0 : (Time.now - list.min_by(&:date).date) / (60 * 60)
    end
def age list = txns list . empty? ? 0 : ( Time . now - list . min_by ( :date ) . date ) / ( 60 * 60 ) end
Age of wallet in hours.
Age of wallet in hours .