Board Thread:Naruto Discussions/@comment-25531508-20140923043228/@comment-4728499-20140924112752

Nothing to say that he couldn't use any jutsu he knew, but it's like Kakashi, we were never going to see everything they could do, Hiruzen being older would want to conserve energy as much as possible to perform what worked best against his enemy rather than throwing around random techniques.

Hiruzen was not even close to being at his prime at any point that he appeared in the story.