Thread:KusaNin/@comment-37511870-20190314221037/@comment-25156300-20190315003805

Blank Period would be the time before Boruto. It is blank because we don't actually see it (a bigger timeskip than what led to Shippuden). So The Last would fall under that. However, there is usually another age labeled Epilogue (or you could even say New Era) that would be the Boruto time. (Technically the Epilogue is a few years prior to Boruto, but compared to the Blank Period, the two are basically blended together).