Window Leakage/Rust Results...

[Texas Jim]

I pulled the chrome on the bottom edge of my rear window on my '71 Olds 98, and found that rust had eaten holes in the metal there. I uncovered it all and temporarily sealed it up well. It's raining like heck here in Texas today and this afternoon I had water dripping inside from the top of the windshield. I cut the vinyl top in the front over the windshield and checked f/ rust there also, after finding the rust at the bottom of the back one, and found that the area above the windshield was clean and rust free. When I ran my finger along the top of the windshield inside the car, the weather stripping there came off like dust, very dry and gone.
I'm 52 years old now and have had quite afew older cars and trucks during my life, as I've always been a motor-head. I can't remember very many of the old rides I've owned that had rust primarily around the windows. I say primarily because this '71 98 I have doesn't even have any parking lot dings on the sides and is completely rust free, w/ the exception of around the back window, and now I'm hoping I won't find any rust around the windshield, but the windshield IS leaking.
My question is this; Are the older Oldsmobiles know f/ the front and back windows leaking and in-turn rust forming under the chrome and vinyl top in these areas?
I grew up in New York where the winters along w/ the salted roads to melt ice destroys the metal on rides, and in Puerto Rico where the salt in the air from the ocean rusts the rides all-over in time. Here in good old hot/dry Texas, the rides are quite clean and rust free in most cases. This '71 98 I have is a one owner Texas car, has 93,300 miles on it and was sitting f/ the past 10 years. The car wasn't garage-kept, but still it seems to me that f/ the age of the car, there's alot of rust under and around the rear window, so far...