Here is Tiger as a 2-year-old. She lived to be 19-1/2. ~ August 1982 - February 15, 2002.
She was a stray, and when we took her in, she would eat anything that didn't eat her. She got really tubby, and we
used to call her "Little Rotunda," but she shed the weight naturally when she wasn't in a panic for her next meal
because she could count on us to feed her on schedule.
This picture was taken just a few weeks before she died:

She sat there like that in the hallway for quite some time. I took several pictures of her since I loved the composition,
and I was aware that I would cherish the image as a memento.
Beautiful cat. You're not going to believe this, but my mom's cat Ginger (a cat I actually acquired as a youngster) was born in the early summer of 1982 and lived until late 2001/early 2002. I remember when she was put down because I was pregnant with my second and had to go for an ultrasound soon after. She was the one that was 19.5 Her name was Ginger, but I called her Bijoux. She didn't really look like your cat, but she was kind of a calico/tabby like yours. I probably don't have any pics of her on my computer, but I will try to find one at my mom's and post it.
Well how nice for you and her that she was a stray and lived to such a ripe old age.