Why Do We Feel Time Slip Away Faster as We Age?

Imagine you are five years old. You eat a slice of birthday cake every single day because school is fun and new things happen all the time. That one year feels long because your brain was busy saving every tasty moment. Now, imagine you are thirty. You go to work, come home, and watch TV. It happens every day without much change.

When something stays the same, your brain stops recording it in high detail. It puts the memory in a box labeled "routine" and forgets the details. So, when you look back at age thirty, those years seem to fly by because there are fewer unique memories to count.

Your first year is 100% new stuff. Your second year is still very new. But by age fifty, most days feel identical to the last. The brain uses a shortcut called proportional theory. To a one-year-old, ten years is half their life! To an eighty-year-old, ten years is just twelve percent. So time feels faster because you have less of it left compared to what you have already lived.