Nuclear reactors, not power plants, you can still have a functioning power plant just with one or two reactors turned off. I didn't say they don't age, I said they don't age like coal ones do, a nuclear power station can run for 80 years but it's regulated to 40 years as that's the peak life span of a coal one.
Nuclear is the cleanest solution we have, but it's thanks to the nuclear fear that we don't have more of them. We'd have less carbon emissions, less deaths due to pollution and we'd probably have a cleaner environment, as the amount of toxic waste a nuclear power plant generates in 60 years is less then a basketball court. This isn't the Simpsons, there is no green goop that floats in rivers making three eyed fish. It's spent gray metal that is locked in concrete and is relatively safe.