SELECT
	CASE
		WHEN age BETWEEN 0 AND 10 THEN '[0-10]'
		WHEN age BETWEEN 11 AND 20 THEN '[11-20]'
		WHEN age BETWEEN 21 AND 30 THEN '[21-30]'
		WHEN age BETWEEN 31 AND 40 THEN '[31-40]'
		WHEN age BETWEEN 41 AND 50 THEN '[41-50]'
		WHEN age BETWEEN 51 AND 60 THEN '[51-60]'
		ELSE '[61+]'
	END AS age_group,
	COUNT(age_group) AS count
FROM
	wizard_deposits
GROUP BY
	age_group
ORDER BY
	age_group;