I’m a USN/USMC flight test engineer, electrical, and my colleagues and I are one of the reasons these aircraft last so long. We conduct regular, rigorous inspections of the aircraft and assess new improvements to the aircraft. First and foremost in our minds is the safety of the aircrew. They are what keep my mind focused wether it’s below freezing or over 100f in the shade. I take my job dead serious when I sign that piece of paper saying the aircraft is safe to fly.

This is Amazing, I knew that planes are built to withstand strong forces, and if maintained properly the can last for a long time but I didn't know that is possible with planes in active duty, 100 years is very long time ....

Wow, the "mechanic" at 04:42 is using a pair of "precision" vise grips to work on the B-52!  This is not the USAF Air Force I served in!  I flew G & H models from '75 until '90.  I wonder what the PMEL calibration procedure is for Vise Grips?

Build one with 100% high grade titanium, and since were not at war, just fly it at low level around 20,000 ft not always at maximum altitude it is designed for. There its life span will get around 89 years to 108 years, of airframe life. The engine should also be made of titanium compressor blades, the most sensitive part of the jet engine