100 Years
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My dad worked on them in the late 50s and early 60s.
He was a cog in LeMay's SAC.
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Common
They do have a lifespan.
I worked with a guy in the 70s who got blown out of a B52 over Hanoi many years before and ended up in the Hilton.
I worked with an instructor a couple years ago who launched the first cruise missiles of Desert Storm from his B52. He went on to fly the first B2 mission, from Whiteman AFB Missouri to Kosovo and back -non-stop.