I have a three year old peace lily. The last couple of weeks the leaves have been droopy and even after watering and fertilizing, the leaves still remain droopy. I have checked for spider mites and checked the pot to see if the plant is root bound or has root rot but neither seem to be occurring. Any suggestions?

Change the soil on the lilly, all new soil and clip any leaves you can before you transplant, into a NEW container. The soil change is as impotant as the container change sometimes. Hope this helps

I concur on a soil change. And you might be over fertilizing it. Sometimes the soil gets built up with salt and minerals from the water, and needs to be changed or flushed out well. Also, Peace Lilly's like to be pot-bound. So don't worry about that issue :)