I think he has two separate audiences, because like the above poster said his shows are filled with young people. But I personally know a lot of brothers mid 30's and up that are out of tune with commercial rap, but f^ck with Rozay. I don't know many other older rappers who do as well with fans in their age group. It's hard to pinpoint, but I think he has a cool blaxploitation hero vibe to him. At the end of the day his name might not fit on a list with Biggie, KRS, Kane, Rakim, Slick Rick, Nas, Jay, Tupac, Scarface, Cube, Em, etc...
But when you talk about Shaft, Superfly, Dolemite, The Mack.... you can see how he's channeling a lot of that shyt, and why older brothers might enjoy his material.