Nice post. I had an old girl who lived 21-1/2 year. She was mostly black as well, with just a tiny, thin, patch of white on her chest. We have 5 cats around here right now, and the oldest is almost 15. He was born in Miss Penny's lap.
I see you have done what we do, put cat beds in windows! They do love it. As I type this, I have 3 in the office with me. The two baskets are "full" of cat. My gray striped one is in the top basket right now. A different black one is below her. So, basically, your house looks a lot like mine!