Angelina Jolie and Brad Pitt’s son, who still goes by his dad’s name and looks just like him, just turned 17. Check out his much-talked-about photos in the comments 👇 .

Yet the photographs still attracted considerable attention because Knox had grown substantially since his previous highly publicized appearance.

Parade reported that Knox was already noticeably taller than his mother and described the outing as a rare joint appearance.

That illustrates an important point about celebrity children.

Sometimes the public does not see them for months or years.

Then a single photograph appears and people immediately notice the changes in their appearance.

The “17 years old” claim is now outdated

The viral caption says Knox “just turned 17.”

That information would have been accurate around July 2025, but it is no longer correct.

Knox and his twin sister Vivienne were born on July 12, 2008.

They turned:

16 in July 2024

17 in July 2025

18 in July 2026

Therefore, in September 2026, Knox is 18.

This is a good example of how social-media posts can continue circulating long after their original publication date.

A caption may have been written when a celebrity was 17, but if the same post is reshared a year later, readers may assume that the information is current.

The photograph may also be older.

So whenever a celebrity post says someone “just turned” a particular age, it is worth checking the original publication date.

What about the claim that Knox still uses Brad Pitt’s surname?

This is where the story becomes particularly interesting.

For many years, Knox was publicly known as Knox Jolie-Pitt.

That double surname reflected both sides of his famous family.