Synonyms of the word

senescent

• adj. Growing old; decaying with the lapse of time.
• adj. Characteristic of old age.

ageing

• v. (Australia, New Zealand, Britain) present participle of age.
• n. (Australia, New Zealand, Britain) The process of becoming older or more mature.
• n. (Australia, New Zealand, Britain) The deliberate act of making something (such as an antique) appear older…
• n. (Australia, New Zealand, Britain, gerontology) Becoming senescent; accumulating damage to macromolecules,…
• adj. (Australia, New Zealand, Britain) Becoming elderly.

aging

• v. present participle of age.
• n. (intransitive) The process of becoming older or more mature.
• n. (transitive) Allowing something to become older.
• n. (transitive) The deliberate act of making something (such as an antique) appear older than it is.
• n. (gerontology) Becoming senescent; accumulating damage to macromolecules, cells, tissues and organs with…
• n. (euphemistic) Elderly person. Only as a collective plural in "the aging".
• adj. Becoming elderly.

old

• adj. Of an object, concept, relationship, etc., having existed for a relatively long period of time.
• adj. Of an item that has been used and so is not new (unused).
• adj. Having existed or lived for the specified time.
• adj. (heading) Of an earlier time.
• adj. Tiresome.
• adj. Said of subdued colors, particularly reds, pinks and oranges, as if they had faded over time.
• adj. A grammatical intensifier, often used in describing something positive. (Mostly in idioms like good old,…
• adj. (obsolete) Excessive, abundant.
• n. (with "the") People who are old; old beings; the older generation, taken as a group.