CAT5 cable life expectancy

I am about to reconfigure our server room. The server room may move to a new location in our office. Our existing cabling is CAT5 and is approx. 12 years old. Is it more practical and cost effective to recable or to reuse existing cables? I understand that reusing existing cabling may be more troublesome since trying to track down existing cabling is time consuming and bending and/or pulling on old cables can damage them. Are there documented white papers or recommendations for cable life?
Thanks.