I would think that the buff has been well tested, by now!

The B-52 will be part of the AF's arsenal for another 30 years if the
budget docs I read every day at work are correct. There's plenty of
life left in that airframe - there's an avionics upgrade currently
underway that includes the INS and DTUC systems that's funded through
FY06. If they ever get around to reengining those planes they'd
probably fly another 50 years until they were 100.

Wooly