Kids learn to talk
with no effort.
Why is a new
language hard
for adults?

The full narration of the video.

Twenty thousand hours. That's roughly how long a child is awake by age five. And all that time, someone nearby is talking to them, singing, calling their name. Now you: ten years of school English, four or five classes a week, about a thousand hours in class, all told.

That's about twenty times less. So if English never stuck, it's not because you're slow. People say kids are language geniuses. Actually, they're not fast at all. The first word shows up around age one. At eighteen months, many kids know just a few dozen words.

In 1978, researchers in the Netherlands followed fifty-one people: English speakers who had just moved there, kids and adults alike. In the first few months, teenagers and adults improved fastest; the three-to-five-year-olds came last on every test. So where do kids win? Think of learning to talk as wearing paths into a field of grass.

A path only gets firm after you walk it again and again. A child has twenty thousand hours, walking every day. When they get it wrong, nobody laughs; grown-ups even finish the sentence for them. So they keep walking, a lot. And the biggest thing: their field starts out empty.

Babies a few months old can tell apart sounds from many languages, even ones they've never heard. Around their first birthday, they keep the sounds they hear every day, and slowly lose the rest. The paths they use most get packed down from here on.

When you learn a new language as a grown-up, your mother tongue's roads are already under your feet. Adults have long legs and start out quick; but every step slides back onto the old roads. That English sound where your tongue peeks between your teeth? Many of us hear it as "s", and say it as "s". That's an accent.

A study of over two hundred Italians who moved to Canada found: the older they arrived, the stronger the accent, even thirty years on. Grammar too. In 2018, an English quiz taken by over six hundred thousand people found: the knack for grammar stays strong until about seventeen, then slowly declines. To sound exactly like a native, it helps to start before ten, and be surrounded by it every day.

Is it the brain changing, or just that adults have jobs and no time to soak in it? Scientists are still arguing. So kids aren't faster. They put in more hours, aren't afraid of mistakes, and start with an empty field. An adult accent is hard to change, but fluency still comes from walking the path: listen a lot, speak up, and keep going when you slip.

After all those years of English, what was the first sentence you actually dared to say out loud?