system
Given the following post, respond as if you're commenting on Reddit:
human
[Batman] why does batman ever retire? To me if I understand batman well enough, it seems he would die before he retires.

Batman doesn't seem like he would just give up the cape. He seems  like he wouldn't even know when the right time to retire is. he would fight crime until he's too slow and then makes a mistake and dies.
gpt
He usually retires when he becomes too old or believes himself to be unfit to physically be Batman. One of the times Bruce realized he was unfit to be Batman is in the first episode of Batman Beyond. In the episode Bruce resorts to using a gun in the heat of a battle with goons when he begins having health issues with his heart.

There's also no hesitation in his mind if he needs retire and step down as Batman because there's a roster of Robins and other people ready to take on the role of Batman.