Age range query in MySQL based on two age fields - php

Question

I'm losing some hair over this. I found several online threads with a similar issue, but not exactly what I am running into, so I am still a bit jammed.
I am writing a very complex query (at least its complex for me :))
In my ages table, I have an age_start and age_end field.
For example:
age_start | age_end
------------------------
0 - 64
19 - 23
0 - 19
25 - 29
65 - 100
...
And what I am trying to achieve is a query which reads in between these ranges.
The best I have come up with so far is having these two fields set as array values, and in my MySQL query do something like:
Enter Age: [ 33 ]
Get ages data into an array. And then query like:
...WHERE $age >= $age_start AND age <= $age_end...
Would return:
age_start | age_end
------------------------
0 - 64
25 - 29
Does anyone have any ideas or suggestion or a better approach to this?

Answer 1

SELECT *
FROM ages
WHERE 32 BETWEEN age_start AND age_end

Answer 2

SELECT
CASE
WHEN age < 13 THEN 'Under 13'
WHEN age BETWEEN 13 and 15 THEN '13 - 15'
WHEN age BETWEEN 16 and 20 THEN '16 - 20'
WHEN age BETWEEN 21 and 25 THEN '21 - 25'
WHEN age BETWEEN 26 and 30 THEN '26 - 30'
WHEN age BETWEEN 31 and 35 THEN '31 - 35'
WHEN age BETWEEN 36 and 40 THEN '36 - 40'
WHEN age BETWEEN 41 and 45 THEN '41 - 45'
WHEN age BETWEEN 46 and 50 THEN '46 - 50'
WHEN age BETWEEN 51 and 55 THEN '51 - 55'
WHEN age BETWEEN 51 and 55 THEN '56 - 60'
WHEN age BETWEEN 51 and 55 THEN '61 - 65'
WHEN age BETWEEN 51 and 55 THEN '66 - 70'
WHEN age BETWEEN 51 and 55 THEN '71 - 75'
WHEN age BETWEEN 51 and 55 THEN '76 - 80'
WHEN age BETWEEN 51 and 55 THEN '81 - 85'
WHEN age BETWEEN 51 and 55 THEN '86 - 90'
WHEN age BETWEEN 51 and 55 THEN '91 - 95'
WHEN age BETWEEN 51 and 55 THEN '96 - 100'
WHEN age >= 100 THEN 'Over 100'
WHEN age IS NULL THEN 'Not Filled In (NULL)'
END as age_range,
COUNT(ids) AS age_count,group_concat(ids) as chart_ids
FROM (SELECT
TIMESTAMPDIFF(YEAR, `TABLE_FIELD_OF_DATE_OF_BIRTH`, CURDATE()) AS age, user_id as ids
FROM
jw_user
WHERE
is_active=1
AND
is_deleted = 0
) as derived
GROUP BY age_range
ORDER BY age_range
and the would be amazing :)