1. Characteristic of a decrepit person who exhibits the weakness or diseases of the declining years: Mr. Black, the senile patient at the nursing home, always wanted to sit outside instead of being in his room.
2. Belonging to, suited for, or an incident of the golden years: The retired chairman of the board, Mr. Fisk, walked with a senile gait because of his ripe and waning existence.
3. Forgetful, confused, or otherwise mentally less acute in later life: Like many other people, Mr.Evans had a senile moment when he walked into the room and forgot what he was looking for.
4. Occurring in or believed to be characteristic of being a senior; especially, during the period after the mid sixties: Because of his senile age, the law required the man to take a test drive before renewing his driver’s license.