What is the correct syntax to annotate a variable `age` as a number in TypeScript?

Explanation

To annotate a variable `age` as a number in TypeScript, the correct syntax is `let age: number;`. This syntax explicitly declares the variable `age` as a number type.

Key points

TypeScript uses the colon (:) to specify variable types
The keyword `number` indicates that `age` should be a number type
Incorrect syntax like `let age = number;` does not correctly annotate the variable

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