1. The quality or condition of being weakened, worn out, impaired, in poor working order, or broken down by old age, illness, or hard use: Henry realized that decrepitude was creeping into his life even more at the age of 75 because he had to wear a hearing aid and stronger glasses, he needed a cane for walking, and he had uncontrollable arthritis in the joints of his elbows, fingers and knees.
2. Etymology: from Latin decrepitus (de- + crepitus from crepare, "to crack, to break" + -tude, "quality, condition of"