decrepitude

noun decrepitude

• weakness — the state or quality of being weak; lack of strength, firmness, vigor, or the like; feebleness.
• age — Your age is the number of years that you have lived.
• infirmity — a physical weakness or ailment: the infirmities of age.
• dilapidation — to cause or allow (a building, automobile, etc.) to fall into a state of disrepair, as by misuse or neglect (often used passively): The house had been dilapidated by neglect.
• decay — When something such as a dead body, a dead plant, or a tooth decays, it is gradually destroyed by a natural process.