I don't think it has anything to do with age - I got a 4 year degree in computer science at age 45. I can take a logic truth table and design the circuit to implement it, but that is not the point.
I firmly believe that mastering computer controlled systems can be thought of as similar to flying a helicopter. When you fly a helicopter you do not have time to think about the mechanics - the swashplate pushing the rotor blades depending on how you are using the cyclic vs. the collective. A guy I trust a great deal advises his students to never think about all that - he tells to think of it as "magic" and learn to work with the results, not how the results are derived.
I think you can do the same with the electronic controls on machinery. Quit thinking about the logic, binary, or how it all works. Just trust that the under the hood stuff will work and deal with the results of the action you take. It will clear your mind and let you work with the system.
As far as repairing them, forget about understand how to diagnose a module - that is left to those trained for it - and concentrate on operation, trusting that many repairs will need to be done by someone else. And - the repairmen for the computer may not even be able to operate the whole machine - different skills. It is like not having to understand foundry work to operate something made of cast iron.
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