The Five People You Meet in Heaven Where does Eddie's fourth stage of heaven begin? What is his physical condition?

From the text:

EDDIE BLINKED, AND FOUND HIMSELF IN A small, round room. The mountains were gone and so was the jade sky. A low plaster ceiling just missed his head. The room was brown—as plain as shipping wrap— and empty, save for a wooden stool and an oval mirror on the wall. Eddie stepped in front of the mirror. He cast no reflection. He saw only the reverse of the room, which expanded suddenly to include a row of doors. Eddie turned around.

Then he coughed.

The sound startled him, as if it came from someone else. He coughed again, a hard, rumbling cough, as if things needed to be resettled in his chest.

When did this start? Eddie thought. He touched his skin, which had aged since his time with Ruby. It felt thinner now, and drier. His midsection, which during his time with the Captain had felt tight as pulled rubber, was loose with flab, the droop of age.