1991. So, 25 years old, by my high school math.
Not sure why it would matter.
I mean, here are some books that are over 40 years old:
The Adventures of Huckleberry Finn - Mark Twain
A Tale of Two Cities- Charles Dickens
The Bible...
oak, u do realize that huckleberry finn and so is fiction, right? Whereas Organized crime should belong to the true crime section, and the internet for information gain (beginning in the mid-late 90s) is invaluable for such a task. That was my point. Before the 90s, u had either to completely trust your source (The last mafioso comes to mind) or do years of research in local libraries. Not to forget, sites like maryferrel are priceless.