Some pathways are used for more than one thing. Years ago, I attended a conference where we were told that music and math share the same pathway and that is why the Japanese are good at both. I don't have any evidence for this but it makes sense.

15 Minute Manifestation

Well, back to the perception of time. If our reality is actually based on our past experiences then it makes sense that children would think time goes slowly and adults would think it goes quickly. The adult has had many more opportunities to learn about days, months and years as well as what to expect. They have developed a familiar pathway that explains time.