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SENILITY. The state of being old.
     2. Sometimes in this state it is exceedingly difficult to know whether the individual is or is not so deprived of the powers of his mind as to be unable to manage his affairs. In general, senility of energy in some of the intellectual operations, while the affections remain natural and unperverted; such a state may, however, be followed by actual dementia or idiocy.
     3. When on account of senility the party is unable to manage his affairs, a committee will be appointed as in case of lunacy. 1 Coll. on Lunacy, 66; 2 John. Ch. R. 232; 12 Ves. 446; 4 Call's R. 423; 5 John. Ch. R. 158; 8 Mass. 129; 2 Ves. sen. 407; 19 Ves. 285; 2 Cyclop. of Pract. Med. 872. See Aged Witness.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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The answer to the above question at the end of the book has been shown as: Dusk is to dawn as Senility is to childhood.
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