Construct a valid SQL statement.
Retrieve the names and ages of all the students who live in Brisbane.
The following is a valid SQL statement that can be used to retrieve the names and ages of all the students who live in Brisbane:

`SELECT name, age FROM students WHERE city = 'Brisbane';`
Complete the following task based on the instruction and optional input provided.### Instruction:
Construct a valid SQL statement.

### Input:
Retrieve the names and ages of all the students who live in Brisbane.

### Output:
The following is a valid SQL statement that can be used to retrieve the names and ages of all the students who live in Brisbane:

`SELECT name, age FROM students WHERE city = 'Brisbane';`