[thunderfork]

Whereas a society replaced by children...

[greenavocado]

Whereas a society replaced by its own children maintains continuity of community, nation, or broad grouping of people having common traditions, institutions, and collective activities and interests

[eru]

What about those societies that have traditionally replaced themselves via immigrants? Moving to a replacement via kids would be the change for them.

[thunderfork]

Plenty changes between generations. Still not the same society.