How "at the age of" differs from "in the age of"

Why do we say "at the age of 10" but "in the age of technology"? One little word changes the meaning completely. Here's what sets them apart.

In the age of

We use "in the age of" to talk about a period of time shaped by something, like a technology or a trend. It can describe the past, but very often it's about right now.

• In the age of the internet, information is everywhere.
• In the age of streaming, hardly anyone buys DVDs anymore.
• In the age of WhatsApp, a handwritten letter feels special.
• In the age of knights, many castles were built on cliffs.

You'll also hear "in the digital age" or "in the age of AI," which work the same way.

At the age of

"At the age of" is about a person and how old they were when something happened.

• He joined the military at the age of 18.
• John started his own business at the age of 22.
• At the age of 15, Claire won her first music competition.
• She started playing the piano at the age of six.

This one is a common trap for German speakers. Because German says im Alter von, it's tempting to write "in the age of 15." In English, a person's age always takes "at."

"At the age of" also sounds a bit formal. In everyday conversation, people usually shorten it: "She started piano at six" or "I moved here when I was 18."

So if you're talking about a person, it's "at." If you're talking about a whole era, it's "in."

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