FFS stop spreading bad info regarding professions. Smelting cobalt only gives skillups from 350 to 375 (albeit at a really slow rate); saronite, titanium, and titansteel do not give skillups period. This does NOT CHANGE whether you are level 55, level 60, level 70, level 80, or level 85. The ability to gain skillups from smelting has NOTHING to do with your character's level other than the level required to train grand master/illustrious/whatever other rank if you're capped at the previous level.
(titanium and titansteel don't give skillups at the moment obv, but they are grey at 450 so they won't give skillups in cata either unless they decide to change it, they probably won't since they didn't do it with khorium and hardened adamantite)