I wonder a bit about that. What activities or possibilities are you exposed at during that age.
I know many computer science colleagues who were not exposed to programming during that age and only later came to it.
I feel kind of lucky that somewhat randomly I stumbled into computer programming (because XtreeGold could show the content of files, and I was learning to understand BAT-files by looking into them) during that age, and that's what I do now.
There are probably a lot of things you were not exposed during that age, that could have been the perfect match.
There are also lots of kids who just play games, or video games, do sports, watch films or so during that age, without really being exposed to any "potential useful" activities. Some parents would maybe even say that this is how it should be.
As a parent, I guess a good advice would be to try to expose your child to as much things as possible, without forcing it to do anything of course.
Murch actually expands on that a little more in the interview. He doesn't mean the specific activity is what your job should be, it's more like "the basic similar activity."
So for him, as a video editor, it was using a tape recorder to record sounds, and reorganize them in an aesthetically appealing way. He didn't actually get into video editing specifically until after college IIRC.
I first touched a computer after completing my university degree and I still remember the happiness I felt by simply running a DOS command and seeing the expected output.
It does't matter when the plug finds the socket - it is always electric.