the state of being senile, especially the weakness or mental infirmity of old age.

1770–80; senile + -ity Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
senile (ˈsiːnaɪl)
1.  of, relating to, or characteristic of old age
2.  mentally or physically weak or infirm on account of old age
3.  See old (of land forms or rivers) at an advanced stage in the cycle of erosion
[C17: from Latin senīlis, from senex an old man]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

senility se·nil·i·ty (sĭ-nĭl'ĭ-tē)

  1. The state of being senile.

  2. The mental and physical deterioration characteristic of old age.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
She'd want to know how doctors ended up curing cancer and senility.
By reposing on their laurels, they soon sunk into senility.
Wool shirts are fine, but two of them will last from middle age to senility.
He helped establish, for example, that senility is not inevitable with aging.
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