Even though your cat was tested he has the CLASSIC symptoms of hyper-thyroidism. With this disorder the cat will eat and eat and still lose weight. Was a thyroid fucntion test done on him? This is a treatable condition. If your cat is otherwise healthy, he can have more good years.
If his thyroid tests normal then he is suffering from an absorbtion disorder and should be on a VERY high quality diet. No supermarket junk. Look into www.natracat.com and www.canadae.com for excellent choices.
You have obviously given him wonderful care for him to have lived his long. Now we just need to get him back on track.
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