Year 4. Population 20
Both the male and female moleweasels are asexual. Not a single litter. My one tuskox bull prefers other bulls.
No marriages. No children. Only two dwarves are lovers.
This is the longest I've kept a low population. My fps averages 150. Normally it's down to 50 by this time, but I usually have 80+ dwarves by then. I think most of the extra bodies were needed to continuously make clothes and drinks for that many. Stuff is getting done at population 20.
I may have discovered dwarftopia. It even has undead keas.
Edit: half of the dwarves are over 80 years old. Youngest is 57. I appear to have started a retirement community.
That's preposterous. Dwarven retirement consists of maulings, magma, drowning, elves, other dwarves, wildlife, undead, poisonings, infections, lengthy hospital stays followed by FURTHER maulings, starvation, dying of thirst, booze explosions, long falls, ghosts, fire, superbeasts, elephants, sponges, carp, and forgotten beast secretions. And stabbings! Don't forget the stabbings!