AGEING

verb

1. To cause to grow old; to impart the characteristics of age to.
2. To postpone an action that would extinguish something, as a debt.
3. To categorize by age.

noun

1. The process of becoming older or more mature.
2. The deliberate process of making something (such as an antique) appear (or, in science fiction, become) older than it is.
3. Becoming senescent; accumulating damage to macromolecules, cells, tissues and organs with the passage of time; progressing loss of health, mobility, vibrancy and body functionality, resulting in biological death.

adjective

1. Becoming elderly.