While the folks on their 8th like Rooney are an outlier there is something to be said for how serial divorcers mess up the numbers. Almost everybody I know that has a divorce has more than one. That seems to be where the 40 somethings are on that front, they’re either on their first marriage or 3rd, maybe 4th. Who knows, those that live as long as Rooney might be on #8 by then. That just seems to be how the population is divided, there’s those that stay together, and those who wind up on a first name basis with divorce judges, there’s a very small group who apparently got it right the second time.
Now while I realize that is anectdotal, I'd like to look at that more. I was married briefly in my very early 20's, and I've been married to my second wife for well over 20 years now. I know lots of folks in that particular boat.