40 years old is too old for a machine.

You know this green color?   It is the color of the 60's and 70's.     If you walked into an airplane, and it was colored as such, you would be naturally and rightfully worried.    40 year old airplanes should be recycled, not re-inspected.

40 year old power plants, esp. nuclear, should be leveled, recycled as possible, and re-built

Backup power system should be tested under load, every 3 months, and tested every month.