These are things that fellow adults most likely do as well perhaps
  1. French Pressed Coffee
    I recently bought a French Press which has drastically increased my level of self importance.
  2. Having a Calendar
    A Christmas gift from my Dad. This has easily aged me 10 years. Manual calendars have warped my perception of time.
  3. Sending Emails
    Any conversation I have via email instantly becomes infinitely more adult. Highly recommend getting an email address, will improve your life.