Sorry for your loss. I can relate.
Our first cat, a Lynxpoint Siamese female, lived 19 years, 6 months and 6 days when we had to put her to sleep at our vet's. That was a tough decision, but it was the right decision since she wouldn't eat anymore. She was my wife's cat since the cat picked my wife as her favorite person.
We now have a Manx breed tailess tabby male who in June will be 14 years old. He's still going strong since he can still run like the wind and jump way up high if he wants to so I'm hoping his demise is many, many years off. He's "my" cat since he picked me as his favorite person.
When you lose a devoted pet companion; whether the pet is a hunting or non hunting companion, it's always a very, very sad day.