1) Age 2) Dementia 3) Dotage 4) Oldness 1) Aging problem 2) Dementia 3) Dotage 4) Geezerhood 5) Old age 6) Old-age infirmity 7) Second childhood 8) The state of being senile 9) Years 
• (n.) The quality or state of being senile; old age.
old age; the physical and mental deterioration associated with old age.
Old age, the physical and mental deterioration associated with old age. ... (18 Nov 1997) ... 
(sә-nil´ĭ-te) an obsolete and imprecise term used to denote a pronounced loss of mental or physical control in the aged. Certain types of psychosis are associated with aging, such as senile dementia and dementia of the alzheimer type.
Old Age
Se·nil'i·ty noun [ Confer French sénilité .] The quality or state of being senile; old age. 
Type: Term Pronunciation: se-nil′i-tē Definitions: 1. Old age. 2. General term for a variety of organic disorders, both physical and mental, occurring in old age.
Senility: 1. Originally, old age. 2. The physical decline associated with old age. 3. The mental decline once associated with old age but now known to be due to dementia, as for instance Alzheimer's disease and atherosclerosis. 'The road to senility is paved with plaques.' (Paul F. Wehrle, MD [1921-2004] pediatrician and vaccine researcher who help...
[n] - the state of being senile
senility The condition of being senile; old age or the mental and physical infirmity due to old age.
noun the state of being senile
A term meaning "old," once used to describe elderly diagnosed with dementia.