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

[kithrup]

Does Saturn's Children count?

[james_davis_nicoll]

Technically no (at the time the novel is set, human death rates are perfectly in balance with birth rates) but at one time such a society did exist.