:A quick web search reveals that:  Retrogenesis is a relatively new term coined by Dr. Barry Reisburg after many years of observing and investigating Alzheimer’s disease/dementia. The technical definition is: “the process by which degenerative mechanisms reverse in the order of acquisition in normal development."  There are reputable sources for the concept, such as PMID 12184509, but nobody has yet written a Wikipedia article about it, so an editor created the redirect with the idea that it is better than nothing.