It's probably older than the majority of users here. I can remember when it first flew out of the big air base outside of Riverside, Calif. And the shock to the system when it carpet-bombed 5 miles away in 'Nam.
To ensure that some great-grandkids will have a crack at the B-52, the team in charge of increasing the planes’ lifespan is constantly deploying tactics and procedures—non-destructive inspections, structural integrity evaluations—to study how well the airframes are aging, and what steps can be taken to keep them in top condition. This is, after all, new territory for the military, and aviation in general. But so far, everything suggests that these airplanes can keep flying long past 2040.
Story @ How on God’s Green Earth Is the B-52 Still in Service?