寿终正寝

shòu zhōng zhèng qǐn

to die of old age

to die in one's bed at a ripe old age; (fig.) (of a structure or machine etc) to come to the end of its life

寿

shòu

long life

zhōng

end

zhèng

straight

qǐn

old variant of 寢|寝[qin3]