Yes.
If you are in a party with a much higher level character you won't get xp from standard mob kills. However standard mob kills aren't the best way to level anyway...
The best way to level are to run dungeons, fates, and your hunting log. A higher level character can zip you through your hunting log. The dungeons and fates are level synced (so everyone is close to the same level) but having an experienced friend or 3 can get you through them faster.
As a tank you have an almost 0 wait time for any dungeon so you could just keep running them back-to-back through the duty finder if no friends are available to help.

A lot of threads in here complain about how quick it is to level to 50, so if getting there is your goal it should be quick.