Excessive wind noise above 45 mph

[Brewcity]

So, I took the Tahoe on the highway again, and I have some seriously loud wind noise when I get above 45 mph. It actually seems like its coming from the back two side windows, but its hard to tell. Any idea's on what could be wrong, or what to check? Or is this just something I have to deal with on these Tahoe's?
Thanks for ALL the help. I do appreciate it.

 

[SunlitComet]

old compressed door or window seals.

 

[Brewcity]

old compressed door or window seals.

Thanks Sun...so when you say window seals...do you mean the door windows, or the rear windows?
Also...if it is the rear windows...is this hard to replace the seals on them, and what does one use?
Thanks again!

 

[SunlitComet]

door windows if you have a tailgate. to have stationary window seal leak air sound means it is really screwed up. tailgate or barn doors worry about those seals unless you are positive they are the side windows.

 

[Brewcity]

door windows if you have a tailgate. to have stationary window seal leak air sound means it is really screwed up. tailgate or barn doors worry about those seals unless you are positive they are the side windows.

OK...I have the barn doors, so will check those, and replace if needed.
If it continues after that, I'll let you know.
Thanks as always for the guidance and help!