I am working on three separate works for three different audiences. All are non-fiction. One is for children ages eight to twelve, another is for teens ages fourteen to twenty, and the third is for adults. Is it recommended that different names be used, or should they be published under one name?
They are all non-fiction, but what are the topics they are covering? If they are all something like, history books or biographies, there is no harm in using the same name for all three.
Non-fiction doesn't seem to have the same issues with crossing genera or age ranges that fiction does. So unless there is a pressing reason to try and keep them disconnected, I would just write them all under the same name.