My mother-in-law is 90 and uses her computer everyday. At times I have to help her with a problem, but she really does well with it. I've been dealing with computer type equipment since 1966 when they were mostly discrete components (transistors, diodes, resistors). Huge vacuum tube type computers were on their way out at that point in time. In the late 1990s I set up control systems engineering labs at a college and taught DCS (Distributed Control Systems) lab and theory. This is the equipment that controls power stations, refineries, etc. Then I went back into industry for 20 years and supervised teams designing, engineering, procurement, etc. for refineries, power plants, chemical plants, etc. So it has been a long time and many changes.
Getting to know computers is like learning to do leather work. You keep working at it and practice until it works for you. You can do what you want to do and apply yourself to.
Tom