I'm having a blast in Eureka so far! Was helping another player complete logs, we chatted and I found magicite!

This is without a doubt the experience I've been looking for in final fantasy xiv. I guess my question... Once you reach the max level in Eureka(what is the max level?), can I level sync and help lower level players in Eureka, complete logs and exp with them? Or can you go back down to level 1 and start over?