Is Dwarf Fortress infinite?
Since there is no way to win, it only ends when the entire colony is defeated by the various possible threats, or the player decides to abandon or retire the fortress.109 Hours

Single-Player Polled Leisure
Main Story 5 99h 17m
Main + Extras 2 175h
Completionist 2 250h
All PlayStyles 9 204h 44m

DF is not necessarily difficult but it's complex and sometimes uses slightly weird logic. Once you get your brain around that though, running a medium size fort is totally doable. After a point, the complexity will ramp up again solely because there's loads of stuff to manage and take care of.

What is the goal of Dwarf Fortress : There is no way to win Dwarf Fortress because there is no end screen and no real goal. The apparent goal is to become a mountainhome — a capital — but the game doesn't stop there. That means that every fortress you construct will ultimately collapse.

How long can Dwarf Fortress last

Infinity. Dwarf Fortress has no win condition. With a single exception in Archcrystal, your fortress is likely to be wiped out within the first 10–20 years; if you even get that far. There is no official way to win the game.

What is the max world age in Dwarf Fortress : The 250 year limit is the default limit. You can change this at the world generation screen (pick year 500 instead) or by going into advanced worldgen. The longer your history, the bigger your world, the bigger your embark, the more heavier and likely crash-prone your game. Just FYI.

It is absolutely possible to make a thriving colony, however as there is no way to necessarily 'win' dwarf fortress, you will eventually start new fortresses no matter if your previous one was destroyed by demons or if you just grew bored.

Infinity. Dwarf Fortress has no win condition. With a single exception in Archcrystal, your fortress is likely to be wiped out within the first 10–20 years; if you even get that far. There is no official way to win the game.

Why is Dwarf Fortress so hard

Dwarf fortress is difficult for two reasons 1: Unintuitive interface. It takes some time just to learn how to do basic things and find the information you need. 2: Complexity. Once you know every possible command you can give you need to figure out what to do.Angels, and their variants, are the absolute strongest creatures in the game, acting as the "final bosses" of the game if playing in "Adventure Mode".The Z levels are somewhat limited to the surroundings. For example, the map is limited in the positive direction to like 10 levels above the highest naturally created structure (*). So for a ocean coast embark, you'll be limited to Z +15 (Ground at Z=0 plus height of trees).

The world size doesn't affect FPS all that much as far as I know (embark size does) but it does affect the time it takes when saving. For those that don't know… Water flowing down multiple levels also makes a huge impact.

What is a good population for Dwarf Fortress : Yeah, 30 is probably better. Starting out with 12 seems to be good for my tiny forts just getting used to the game. The default of 200 I feel just causes your fortress to get flooded with people and you're panicking trying to meet everyone's needs.