(n.) The state or quality of being old; old age.

advanced age advanced years age of retirement an incurable disease anility caducity debility decline of life declining years decrepitude dotage eld elderliness feebleness green old age hale old age hoary age infirm old age infirmity infirmity of age longevity old age pensionable age ricketiness ripe old age second childhood senectitude senility senior citizenship superannuation the downward slope the golden years vale of years white hairs