Noun
The quality or state of being senile; old age.
Source: Webster's dictionaryAt least one chronicler claimed that fear of senility or other debilitating diseases of old age was also a contributing factor. Source: Internet
Dementia in the elderly was called senile dementia or senility, and viewed as a normal and somewhat inevitable aspect of growing old, rather than as being caused by any specific diseases. Source: Internet
"Syncope" meant failure of the heart and "senility" in the nineteenth century was an infirmity of advanced old age, rather than a loss of mental faculties. Source: Internet
From the time of his coronation, all real power was transferred to Philip, as his father slowly descended into senility. Source: Internet
Now bordering on senility, the wizard is still a force to be reckoned with. Source: Internet
It is the most common cause of premature senility. Source: Internet