That is extremely high, I finished Dragonspyre at level 46 or 47. I had to do a bunch of crappy side quests so I could be sufficient level ( 48 ) to start Celestia XD.
However, you are NOT too high of a level. I think that there is a too low (for example, my friend started it at level 40 and kept dying) but there is no such thing as too high. It only means you will have an easier time moving through Dragonspyre, and you'll be able to call for friends less than I had to.