Your challenge is to have found the oldest active cache in at least five different states. It must have been the oldest cache in that state when you found it. These requirements could be dynamic if the oldest cache in a state happens to be archived or perhaps disabled or if a cache is unarchived. These instances are unlikely but possible.
Offhand I can give you a list of some of mine.
Utah, Potter's Pond
Colorado, Tarryall
Georgia, The Beaver Cache
South Carolina, Modoc Stash
New York, The Spot
Pennsylvannia, State Game Lands #109
New Mexico, Open Space Letterbox, 7A
Nevada, XKD-380
