How long should you date someone before you move in together?

So tmi but my boyfriend recently moved into a new apartment with his friend to help his friend out of a tough spot. Recently my boyfriend told me it seemed like his roommate was being really shady and resorting to old habits (I don't want to say what exactly on here but just not good stuff should do) his roommate has a past and my boyfriend said he is nervous that he's going to get in trouble for trying to do the right thing by helping a friend out. 
​Long story short my lease is up in 2 months and my boyfriend said he really liked the building he was in but they only had two bedrooms so I said maybe we should get an apartment together in that building. (It would be a two bedroom and everything) we will have been dating for a little over a year by than. Is that to fast? I've never lived with a boyfriend before. I'm not sure if it matters but I'm 23 and he's 27.

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