Why Does Time Feel Like It Speeds Up As We Age?

Imagine your life is a book. When you are five, the first year of your life takes up half of your whole book because it is brand new and full of firsts. But when you are fifty, one year is just a thin page in a thick book that already has many stories.

This happens because we measure time by how much of our total life it represents. One year at age five is 20% of your life. One year at age eighty is only about 1.25%. Your brain looks back and thinks, "That was a big chunk!" but for an older adult, that same chunk feels small.

When you are young, almost everything is new. Learning to walk, riding a bike, starting school. Your brain has to work hard to record all these new details. When you are older, life becomes routine. You drive the same route and do the same job every day. Because the days look similar, your brain stops recording so many details.

Think of a vacation where you try ten new things. It feels long because you have many memories. Now think of a normal week at home. It passes quickly because nothing special happened. As we age, our days blend together into one big "normal" story, making the whole decade feel like it flew by.