wèi lǎo xiān shuāi
to age prematurely
未
wèi
not yet
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
先
xiān
beforehand; first; earlier
衰
shuāi
(bound form) to decay; to decline; to wane