When generating worlds that are old (1k-10k years), I have a very hard time stopping civilizations dying out and every fortress I visit in Adventurer mode is abandoned.
What aspects of world generation effect fortress abandonment and creation? Can you have an old world without many abandoned fortresses, or are they just abandoned as time progresses.
What greatly effects civilizations dying out? How can I generate an old world that has a balanced amount of beasts to civilizations? (i.e. not end up without any beasts nor without any people)