Is there any cure for Onset Adulthood?

You decide. Some profound thinkers here, such as Gunga Dim are not fooled. Whaddayathink?

Well, he DID end up selling a lot of books....

Well! He did steal the theory from Alfred Russel Wallace

He was obviously full of it for stating that birds on various islands evolved from the sort of tortoise that inhabits the Galapagos. Taint possible.

Slight exaggeration there, Rap, as you well know. Darwin and Wallace corresponded from the git-go and found that they were in general agreement on nearly everything as regards evolution. (Wallace, however, never used the expression "natural selection", as far as I know, but did voice opinions not in opposition to the noton.)