Siamese, in my experience, have a slightly shorter lifespan of about 12 years, as compared to the 'British' type, which as has already been said, can live to twenty but more usually 15-18yrs. I'm so sorry Bluesman that you're feeling sad at the thought of saying goodbye, I've gone through that a lot over the years and it's terribly painful. My cats have meant everything to me, and when it's time, I can hardly bear it. But sometimes it's better for the old friend than letting them go on in distress and discomfort. I always trust the Vet's opinion, and take a little comfort in the happy and much-loved life my cat has lived at my side. It's no different IMO to losing a human family member, just as agonising. Maybe you have a few years yet with her, I do hope so. Eliza.