In what scenarios would it be more efficient to perform data sorting and manipulation in PHP rather than in a MySQL query for age group calculations?

When dealing with age group calculations, it may be more efficient to perform data sorting and manipulation in PHP rather than in a MySQL query if the age groups are dynamic and need to be calculated based on the current date. This is because PHP has built-in functions for date manipulation and calculations, making it easier to determine age groups based on birthdates stored in the database.

// Sample PHP code snippet for calculating age groups based on birthdates
$currentDate = date('Y-m-d');
$birthDate = '1990-05-15';
$age = date_diff(date_create($birthDate), date_create($currentDate))->y;

if ($age < 18) {
    $ageGroup = 'Under 18';
} elseif ($age >= 18 && $age < 30) {
    $ageGroup = '18-29';
} elseif ($age >= 30 && $age < 40) {
    $ageGroup = '30-39';
} else {
    $ageGroup = '40+';
}

echo "Age Group: " . $ageGroup;