Is there a junior adult?

This rat rod style hot rod at a small car show in Rio Rancho caught my eye for where it was parked, as well as how it looked.  I cannot say I had ever seen a parking space marked "SENIOR ADULT" before.  Does that mean there must be a junior adult or a senior child space somewhere in the world?  This hot rod was about as ratty as they can come, and I mean no offense by that!  It looked awesome and make me think I needed a tetanus shot just for standing next to it!