Clinically, there are usually only three stages of dementia. The only one I heard about who is in the 4th stage is some clown who looked straight up to the sun during an eclipse, thought he could change the direction of a hurricane with a stroke of a Sharpie, told everyone that drinking bleach cured Covid, and has the continued delusion that he can con all the people all of the time, when he can only con the uneducated and the weak-minded.
It may be of interest to many here that young Americans depend on closed captions far more than older adults. One of many articles. https://www.insidehook.com/daily_brief/news-opinion/closed-captioning-popular
Recent research suggests that pirates never buried their booty/treasures. As some here have stated, the pirates might not be able to return, if they did, might not be able to remember where it was buried, and shifting sands and landscape. RL Stevenson and others had very creative imaginations.
Paws up and claws out. Lily is primed.