What is "opsimath"

n. (context rare English) A person who learns late in life.''Oxford English Dictionary'', 3rd ed., 2004.

An opsimath is a person who begins, or continues, to study or learn late in life. The word is derived from the Greek ὀψέ (opsé), meaning 'late' and μανθάνω (manthánō), meaning 'learn'.

Opsimathy was once frowned upon, used as a put-down with implications of laziness, and considered less effective by educators than early learning. The emergence of "opsimath clubs" has demonstrated that opsimathy has shed much of this negative connotation, and that this approach may, in fact, be desirable.

Notable opsimaths include the fictitious character Sir Henry Rawlinson, Grandma Moses, mathematician Paul Erdős (who published papers until his death at age 83), and Cato the Elder, who learned Greek only at the age of 80.