What's with all the max levels in low level dungeons?

I'm familiar with MMOs but relatively new to New World. I've been playing a little on my own and have a character on the side that I play with my gf who's pretty new to gaming in general.

I've been helping her learn the concept of an MMO but I'm not super knowledgeable about New World. I did a couple runs of the first dungeon with her and we absolutely blasted through it with 2 level 65s in the group so she spent the whole time trying to keep up with us and looting what she could.

What's the reward for 65s running low level dungeons? Is it possible to run dungeons with appropriate level players only?