Its has always been state owned, and it's much better for critical infrastructures to be so anyway.
> suffering from aged power plants having issues?
There was one (1) instance if of a serious common issue between multiple plants found in 2022, unrelated to the age of the NPPs (the most recent were affected as well) which affected the exploitation for about a year. It was bad for a moment, but not that bad, it's like saying the automobile industry can't be profitable because the Tataka airbag problem happened. (And the corrosion issue was much less severe than the Tataka one!).
Over half of french fleet was already upgraded to have safety similar to gen3 reactors through great carenage.
France also set record production this summer vs prev ones