Hi April!
Looks like you found a bit of your own Captain Jack treasure!
Good news regarding your 2006 theme park ticket!
Walt Disney World does honor tickets bought with the No Expiration Option even though this add on no longer exists. You may exchange your now grown child's ticket to an adult one and link it to your
My Disney Experience once you have an updated ticket number.
A Cast Member can assist you in converting your ticket at (407) 939-1289. Have something on hand to entertain you besides listening to Disney hold music because wait times are a bit long these days due to higher than normal call volume.
You may also handle the exchange in person at Guest Services at
Disney Springs, outside the theme parks, or in a
Walt Disney World Resort. Since you need a valid admission to book a park reservation, however, I'd advise verifying your ticket as soon as possible so you can make your
Disney Park Pass reservations.
Wishing you a wonderful adventure!
Elisabeth