I cannot get my head around the absolute irrelevancy of Paul McCartney appearing with Rihanna on a track?

it still doesnt make sense and no amount of radio deals or payola will help me figure that out..
I mean doesn't Rihanna's fan base basically consist of 15 - 20 year olds? Do y'all even know who Sir Paul McCartney is? He's like 70.
Let me stop, yall must of been DESPERATE for that nu RiRi.