I came across this word while looking in the dictionary for another word. This is one of the reasons why I enjoy reading the dictionary, I get introduced to new words :-)
Opsimathy means the process of acquiring information late in life.
1650s, from Gk. opsimathia "learning late in life," from opse "late" (related to opiso "backward" + opisthen "behind") + manthanein "to learn."