My level 50 char got a level 90 raid, a level 60 delivery, and some blue mage stuff. The latter being the only thing he could do on this level (albeit his Blue Mage sitting on level 1, so the 10 mogtomes are not worth bothering anyway).
It don't think it's rocket science to hand out quests that match a character's level. It's just SE being lazy, and not giving an eff whether you can do this stuff or not.