I nursed until I was almost 5 months old.
When other cats and people hear it they are a bit surprised because it's not something they believe is possible. It was amusing to my family to watch as Cory kitten (me!) who was almost as big as her momma still was nursing. I just never wanted to stop. My momma didn't want to stop. It was our favorite time together. And so it was when I was about 5 months old that she finally started kicking me in the head with her hind paws and told me no. I pouted.
When I was spayed when I was 6 months old I was really upset and I wanted to nurse again. My momma kicked me in the head. Then she washed me. Now washing is our favorite thing to do.