What makes the Boeing B-52 Stratofortress so long-lasting?

Two decades ago, working on the B-52 seemed like a brief assignment - not a career

Classic 1960s-Era B-52 Bomber to Fly into 2030s - Warrior Maven

Is the B-52 the longest serving war plane? - Quora

The Legendary Boeing B-52: A Timeless Symbol of Air Supremacy

Boeing Gears Up to Replace B-52 Engines

When will the B-52 Stratofortress become obsolete? - Quora

Why/how has the Boeing B-52 remained in service for so long and not been replaced yet? - Quora

How many B-52 variants are there? - Quora

How The Air Force Plans To Keep The Legendary B-52 Stratofortress

Boeing B-52 Stratofortress - Wikipedia