Have you noticed how childhood summers felt endless, but adult years fly by? Science has an explanation — and it’s unsettling.

When you’re young, everything is new. Your brain records more detail: new places, new faces, new feelings. That makes time feel longer. As an adult, days repeat. Work, home, phone, sleep. Your brain stores fewer new memories, so time feels faster.

Experiments show that when people travel, learn a new skill, or change routine, time feels slower again. Their brains are forced to pay attention.

This means time isn’t speeding up — your life is becoming more predictable.

If you want to “slow time,” the secret isn’t a watch or a calendar. It’s doing things that scare you a little, excite you a little, and surprise your brain again.

Time doesn’t move faster. We just stop noticing it.