Decrepitude - When something becomes less usable or almost useless due to its use over a long time or frequent use, it is said to be a decrepitude.
Open Word Class - Noun
1. This man is now so decrepitude that he cannot even stand up and walk.
2. This T-Shirt has become decrepitude; after all I have been wearing it for 3 years.
3. My guitar does not sound well, looks like it is now decrepitude.