Silk is very delicate, so animals will destroy it quickly. Velvet is also very luxurious, but easy to damage and very difficult to clean.
Sofas: Consider replacing your sofa before the seats start sagging to the point of not supporting you, the fabric has become stained and worn, and the frame is breaking down or squeaking. How long should a couch last? On average, a typical sofa lasts between 7 and 15 years.