Things You Need To Do As An Adult

My wife and I talked last night about things we needed to do. I felt very adult...which I should at 28 and married for 7 years. Give me your suggestions!
  1. Get a mattress topper.
    Because adult = bad back.
  2. Get a will.
    Can't get much more adult than preparing for death.
  3. Change the batteries in the smoke detector
  4. ...get smoke detector.