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

aboriginality abulia advanced age advanced years age age of retirement an incurable disease ancien regime ancientness anility antiquity arteriosclerotic psychosis atavism caducity certifiability childishness cobwebs of antiquity debility decline decline of life declining years decrepitude dementia paralytica dipsomania dotage dotardism drug addiction dust of ages eld elderliness eldership feebleness folie du doute functional psychosis general paralysis general paresis great age green old age hale old age hoary age hoary eld incapacity infirm old age infirmity infirmity of age insipidity instability invalidism inveteracy longevity metabolic psychosis moral insanity neurosis old age old order old style oldness organic psychosis paralytic dementia pathological drunkenness pensionable age presenile dementia primitiveness primogeniture primordialism primordiality prison psychosis psychopathia psychopathia sexualis psychopathic condition psychopathic personality psychopathy psychosis ricketiness ripe old age second childhood senectitude senescence senile debility senile dementia senile psychosis senile weakness senilism senior citizenship seniority sexual pathology shakiness situational psychosis superannuation syphilitic paresis the downward slope the golden years toxic psychosis unfirmness unsoundness unsteadiness unsturdiness unsubstantiality vale of years vapidity venerableness wateriness white hairs wishy-washiness