How old is sunny baudelaire in the 6 book?

It's a little tricky to say exactly how old Sunny Baudelaire is in the 6th book, "The Ersatz Elevator," because:

* Age isn't explicitly stated: Lemony Snicket doesn't often provide precise ages for the Baudelaire children.

* Time is a bit unclear: The books don't follow a strict chronological order, and time jumps occur between stories.

However, we can make some educated guesses:

* Based on the series' progression: The Baudelaires are likely around 11-13 years old in the 6th book.

* Sunny's development: Sunny shows significant language and physical development throughout the series, suggesting she's growing rapidly.

Therefore, it's reasonable to assume Sunny is around 3-5 years old in "The Ersatz Elevator," but her exact age remains a bit ambiguous.