Board Thread:General Grimm Discussion/@comment-78.72.160.162-20150328122307/@comment-26430898-20150531123833

One usually doesn't develope their grimm powers until their thirties, at least, like how wesen don't start to develope their powers until puberty. Trubel was an exception to this and developed them early (as did April, the Drang-Zorn in the episode entitled "the bottle imp"). Josh is still young, so it may be a while before his powers start working.