BTW, this is what the Alouettes stadium looked like when it was new. I think it's fair to say it's not all that old.
The Aud opened in 1940, had a major reno 30 years later to accommodate the Sabres and closed in 1996 at 56 years old. When the Bills stadium is slated to close it will be 54-55 years old.
Camp Nou is about to be fully renovated, at a cost of 1.3 billion Euro and Barca will have to play somewhere else for at least a season. It's also fair to say the climate in Barcelona is a little more structure friendly than Orchard Park.
The argument isn't that you can't have a building that old. Fenway and Wrigley Field are both very old and in ugly climates. However, they are steel structures, not concrete, and that makes a difference. It makes a difference to the preventative maintenance that can be done and the ability you have to repair and replace elements as they cease to be structurally sound. Once reinforced concrete is compromised it really can't be fixed. You can band aid it to extend its life, and they have, but it's not fully repairable and it will continue to degrade until it either fails or you replace it. It's not like a girder that you can brace around, remove, and replace with a new girder (that's not exactly easy either, but it's possible most of the time). When concrete is broken it's broken. When the rebar starts to rust, it continues to rust, and expand, and crack the concrete from the inside. That process has started. It started a long time ago. To continually patch and reinforce is to chase something that wants to turn to dust and it ceases to be cost effective to do so and sometimes it ceases to be possible.
I didn't hear the county arguing that the structure of the upper deck wasn't a serious problem. If it were posturing I'd expect to hear a lot more blow back. You didn't hear it because it IS a problem and they know it's a problem and it's a problem with a very expensive solution. The county has their own engineers and they've gotten their own reports during previous renovation and maintenance work.