That tells me that the 57 year old planes can do something that the 18 year old and the 30 year old planes can't do.
Maybe we should build some new B-52's to replace the old ones. Seems like an ageless design...like they got it right, and the technology hasn't improved much. But, mechanical fatigue is real. A 60 year old fuselage is...well, 60 years old. I'm just amazed that we are confident in 60 year old planes. No matter how you slice it, that is amazing.
But don't get me started on the nukes themselves. We haven't tested one in over 30 years. I've posted on that before. I just have to wonder how confident we can be in our ability to destroy the world. Probably a reasonable chance they will work, I guess.