<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Write a SQL query to calculate the average age of all students in a given class.
<|im_end|>
<|im_start|>assistant
SELECT AVG(age) AS average_age
FROM students
WHERE class = 'X';<|im_end|>
