Longevity of Wool Items

Someone told me they'd been shopping for rugs and been told, "Here is a rug that will last you a hundred years, here is another rug but it has inferior fibre and silk in it so it will only last fifty years."

Only fifty years.  Wow.  I wonder how long my handspun items could last.  I suppose it's a combination of the type of fibre you spin, the method of constructing the fabric, and the wear it has to withstand.  I hear handspun socks can last a distressingly short amount of time or conversely a longer time if knit tightly and reinforced.