A recent example with my little step-brother: he had no problem whatsoever to use the trackpad and click buttons of my laptop to choose another Thomas or Beyblade episode on YouTube. Three years old. And he only saw me do it a few times and then I wanted to read my book without being interrupted every 5 minutes so I told him "use the trackpad, it's this stuff here, use your finger on it and it moves the cursor here [I'm pointing my finger to the cursor on the screen]. When the cursor is on the images of the video you want to see next, you click this button [I'm pointing my finger to the left-click button]". He didn't even asks any other questions. He still interrupted me every 5 minutes but to show me that he just launched the new video by himself... :-).

To emphasize my point, it's not him who is particularly able, his older brother, who is five years old now, was exactly the same at his age.

Older folks are better at analysis and strategy but have a tendency to see things in terms of what they already know. After all, for most of human history, once you learned how the world worked it didn't really change much for the rest of your life.