Yes, I did google first, I found proof that the gathering professions had level requirements, but i need proof for crafting professions, i am trying to prove a point and it is being rather annoying atm, lol, pictures even would help or website urls. it can not be a yes they do.

Each profession has six stages of advancement. You'll begin as an Apprentice, then move on to Journeyman, after that will be Expert, Artisan, Master and finally Grand Master. Each stage has a character level requirement in order to access the next level of training. You must be level 5 to train as an Apprentice, level 10 as a Journeyman, level 20 as an Expert, 35 for Artisan, 50 for Master and 60/65 for Grand Master. Once you're ready to move to the next level, your current trainer will usually tell you where to find a new trainer for the next stage of your development. At Master level all trainers are located in Outland, because players without the Burning Crusade expansion are not permitted to train beyond Artisan level skill. Grand Master trainers are all located in Northrend because the Wrath of the Lich King expansion is required to train that level of crafting.