Dictionary.net

Enfeeblement, as through old age.

Decrepitudo, Aetas decrepita. Ultima senectus, Senecta decrepita seu extrema seu summa seu ultima, from decrepitus, (de, and crepere, crepitum, 'to creak,') 'very old.' The last period of old age, and of human life; which ordinarily occurs about the eightieth year. It may, however, be accelerated or protracted. Its character consists in the progressive series of phenomena which announce the approaching extinction of life. One in this stage of existence is said to be decrcpit, decrepitus, (F.) dicrepit.