ageing
definition: growing old
example: You are aging well.
speech part: adjective
synonyms:
senescent
definition: the organic process of growing older and showing the effects of increasing age
example: Aging has its ups and downs.
speech part: noun
synonyms:
senescence
definition: acquiring desirable qualities by being left undisturbed for some time
example: The wine's aging is excellent.
speech part: noun
synonyms:
ripening