There is an obituary of sorts for a homeless woman named Mrs. Minnie Gayton, nicknamed Minnie the Moocher, in the November 24 1951 edition of the Indianapolis Recorder, which apparently was an African-American newspaper. After describing the scene at the funeral home and the procession to the cemetery, the piece concludes: “Minnie the Moocher is gone—but her memory lingers on. Thirty!”
I don’t know what “Thirty!” means in this context and I don’t know where to begin looking it up. Well, I tried googling a few terms like “Negro slang"+"thirty" but found nothing. Has anyone ever heard of it, or have a reference book that lists it?
Edit: To read the actual obituary, click the link above and then go to Page 12 where it’s in the lower left-hand corner. You’ll almost certainly have to enlarge the view to read it.