Check out my age range is matching or not with the ‘date of birth’ stored in database

I’m using custom post type to creating users in my wordpress website. I’m integrating an advance search for list down the users. In that case I need to search user by age ranges like 21 - 30 31 - 40, But I only have the date of birth of users in the DB. As you know in wordpress posts, it’s stored as meta_key and meta_value in the wp_postmeta table.

I’m writing my own custom query to the search part:

$queryStr = "SELECT DISTINCT ID, wposts.* FROM $wpdb->posts wposts, $wpdb->postmeta wpostmeta WHERE wposts.ID = wpostmeta.post_id";

//if nationality is not empty check it in the DB 
if($sltNationality != '' && $sltNationality != 'Any') :
    $queryStr .= " AND wpostmeta.meta_key = 'nationality' AND wpostmeta.meta_value = '$sltNationality'";

//if age range is not empty check it
if($age != '' && $age != 'Any') :
    $queryStr .= " check age between condition ";

$pageposts = $wpdb->get_results($queryStr, OBJECT);

Now I’m stucked in the age section. As search from the internet, glad I found a code from stackoverflow. get age from DOB

But have no idea how to use this inside my custom query. Please help me guys. thanks

Source: wpdb

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