It really all depends on where you go in the gameworld, and how you play the game.

If you choose to max out all your skills you will get to level 80 and have a lot of health/ stamina/ magicka as opposed to your enemies, that mostly stop levelling at 50.

If you choose to roleplay and stick to the skillset you want for your character you will stop levelling by level 50-60.

The gameworld itself is also varied, like in Fallout.
There are dungeons with monsters that are level 10-15, and dungeons with enemies that are much higher level.
Often, the higher up a mountain you are, the more difficult a dungeon will be.

This is what I think a lot of people dont realise when they say the game is too easy, or hard.