opsimath
A person who learns late in life.
rare
But with reference to the latter, I may be permitted to say, that from the dissipation and idleness of his earlier years, Mr. Fox in Greek and Roman Literature was necessarily an Opsimath.
Where it comes from
From the Ancient Greek ὀψιμαθής (opsimathḗs, “late in learning”), ultimately from ὀψέ (opsé, “late”) and μανθάνω (manthánō, “I learn”); compare opsimathy, philomath, and polymath. First appears c. 1808 in The Gentleman's Magazine.
Adapted from the Wiktionary entry opsimath (CC BY-SA 4.0).