MoP Professions

[degre]

It has been 75 for leveling past 450 ever since Cataclysm came out.

Something was tweaked on the lower ones then, because I'm sure some were 50/60 last week..

As far as I remember they've always been:
level 5 for taking the profession
level 10 for 150
level 20 for 225
level 35 for 300
level 50 for 375
level 65 for 450
level 75 for 525

gathering professions have lower level requirements, they can be taken at level 1, at level 5 you get up to 150 and I don't remember afterward, but surely is lower than crafting professions.