I'm A Banana
Potassium-Rich
Things change over time. "Adulthood" is just one of those changes. Methinks it would go through the same process over ten years of stunted adolescence as well. Nothing stays the same, but I don't think it's age that causes the change in this case as much as it is all the things that go along with age that affect free time (job vs. school, income vs. parent's income, having family responsibilities, not having that childlike endurance, moving, different people entering and leaving your circle of friends, etc.)