It's obvious you have been blessed by a loving God Who chose to give you a wonderful and loving kitty to share your days. Her age isn't that old for a kitty, really, especially one who stays inside. I can tell this kitty has stolen your heart, as my two kitties, Erin, AKA. Mouser (but has never seen a real mouse) and Tweeder, AKA. Twee-Twee, along with my much beloved puppy dog Harvick, AKA. Mi'ter Puppy and Woo-Woo (from our 26 year old daughter Lori who, along with her husband Justin, is expecting a little girl baby in the middle of September). I have been much blessed by my beloved animal friends and know, truly, the depth of what you feel for your precious kittikins. I like the term "kitter". I've never heard that before.
Anyway, may you and Bittie be much blessed, both of you, with a long, healthy life together. May the Lord hold you both close to His Heart.
In Him,
Jim Grayson
Lexington, KY