What is "opsimathy"

Opsimathy \Op*sim"a*thy\, n. [Gr. ?.] Education late in life. [R.]
--Hales.

1650s, from Greek opsimathia "learning late in life," from opse "late" (related to opiso "backward," opisthen "behind") + manthanein "to learn" (see mathematic). Related: Opsimath (n.).

n. learning or education that occurs late in life.