How old do bulldogs have to be to part from their mother?

The average lifespan of an English Bulldog is 8 to 10 years.
The average lifespan of a bulldog is about 8-12 years.

For instance, I have an American bulldog who is 11, her mother died at 11, and my dog is starting to have breathing problems. Stayed up all night to keep a check on her. It's a very gargglely, raspy, breathing problem that can only be stoped by some surgeries..