Tell Tale Yellow Fibers – When Fiber Optics Wear Out

I learned today from a cell phone industry engineer that optical fibers yellow as they age due to the light run through them.  This means that fiber optics actually wear out!  In order to run more data through a fiber optic such as when you want to run on demand video you have to run more power.  More power means that your fiber optic cable wears out faster.  I just searched but could not find anything on this topic.