Senescence
Part of speech: noun
Definition: The state or process of ageing, esp. in humans; old age (cell biology) Ceasing to divide by mitosis because of shortening of telomeres or excessive DNA damage (gerontology) old age; accumulated damage to macromolecules, cells, tissues and organs with the passage of time Fruit senescence, leading to ripening of fruit.
Aging
Part of speech: verb
Definition: To cause to grow old; to impart the characteristics of age to.
Part of speech: noun
Definition: The process of becoming older or more mature.Allowing something to become older.The deliberate act of making something (such as an antique) appear older than it is.Becoming senescent; accumulating damage to macromolecules, cells, tissues and organs with the passage of time
Part of speech: adjective
Definition: Becoming elderly.
Example sentence: As much as I loathe this aging thing, I'm beginning to recognize that I am now a healthier person in terms of self-worth and knowing who I am and where I fit in the world. That's been a good trade-off for the wrinkles.