Jeff pointed out my error. I was referring to each part of an airframe having a service life. I did not mean to imply that the whole aircraft was treated as a single piece with one lifetime.
The B-52s are not the same as they were when they rolled off the line. Lots of upgrades.
Airplanes are like some Porsches. All that is left that is original is the vin plate. 
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened
Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance
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