Does there exist

[james_davis_nicoll]

An SF novel whose setting knowingly includes a global example of a Stage Five society?

[not interested in examples where death rates exceed birth rates for reasons due to calamities like war, famine, plague and the like; those aren't really Stage Five societies]

Comments

[andrewducker]

Simak's "City" has mankind eventually dying out because we just don't reproduce enough to replace ourselves. (There's also the emigration to Jupiter, but the remaining people seem to just lose interest in propagation.)