Here's my observation as a tech that sometimes hangs out just to people watch when the doors open. Kids are generally excited to come in. Then I begin to hear that god awful sound, constant non stop dual flippering at about 4 hz. In my mind I'm seeing the stresses on the linkage and coil stop. No ball there to limit the energy. When I approach the area where I am hearing the OCF usually the parent is (A) unaware themselves what a pinball machine is or (B) the parent is on their cell phone.
However, I did see one instance where a parent brought their child to Strikes and Spares. The little boy seemed interested in that machine for SOME reason. We set him up with the stool riser. His mother was super attentive. I asked if he had ever played before and she said no. First few balls were a disaster. I gave a few pointers. The mother encouraged. This kid was maybe 5 years old. A few more balls and he not ONLY was timing good as best he could BUT he also used left and right accordingly. I often think of this experience when I see the OCF kids and remind myself that that there is hope.
One trick I use sometimes use is - for older kids who should know better, I say to them "Hey do you want to play better? When you play baseball and are up at bat do you just swing the bat constantly?" They generally look at me like I'm a total nut.