Opsimath is a noun that refers to a person who begins to learn or study late in life. 

The Greek word opsi (OPP see) meaning ‘late’ and math (MATH) meaning ‘learn’ give us a word for those who learn late. Our word of the day has been with us since the late 19th century. 

My son is planning on becoming an opsimath. He figures that if he doesn’t graduate from high school until his thirties, he can be recognized as a late bloomer.