Doesnt really matter since you can not do a dungeon that is lv35 when you are 35. Unless you have high level friends to kill the things, it is useless. By rights a group of lv 35 players should be able to do a lv 35 dungeon. By the time you can do it, the gear you get is useless. I personally do not think it is fun following behind a lv 55 doing nothing.
It's not impossible to solo Nom at his level, my account did it numerous times as a lvl36/37. But ofcourse that being said.. yes the gear is/was useless to me considering what i'm wearing to be able to do this and solo it. RoM is still a great place to farm though for selling essences.
To the orignal OP yes you should be in RoM right about now.. to answer your question. You will need to atleast be IN a party to be able to get in there and function without being ported out, but they don't neccsarily have to go with you unless you physically need their help... which you might as i'm abit twinked out as a m/p - p/m so i am not the norm, but i'm a new player and wanted to be strong and didn't have patience to wait till i was 50+ like so many suggested.