(1)Complete
reversal of previous positions on important or
trivial matters affecting everyday life ... normally but not necessarily appearing when one turns 50+ ...
(2)Suddenly
giving up on previously held beliefs ... Flipping-flopping on a given issue ...
Bob is a
peace activist his entire life, but while on his
death bed, he decides that conflict is a necessary action of humanity, he is obviously suffering from "Old Man Derangement Syndrome".
Fran is a life long Republican, but when she turns 60 years old, Fran becomes a Democrat, throwing away long .held political beliefs.
Jim believes in marriage being between a male and female, but in his later years of life, decides marriage can be between a male and female, a male and male, or a female and female.