senility
noun
[ sɪˈnɪlɪti ]
• the condition of being senile.
• "the onset of senility"
Similar:
decrepitude,
infirmity,
feebleness,
unsteadiness,
senescence,
decline,
old age,
dotage,
second childhood,
confusion,
Alzheimer's (disease),
senile dementia,
softening of the brain,
caducity,
anility,
Opposite:
the prime of life,