老骥伏枥

lǎo jì fú lì

lit. an old steed in the stable still aspires to gallop 1000 miles (idiom); fig. aged person with great aspirations

老

lǎo

prefix used before the surname of a person or a numeral indicating the order of birth of the children in a family or to indicate affection or familiarity

骥

jì

thoroughbred horse

伏

fú

to lean over

枥

lì

type of oak