PHP와 MySQL을 사용하여 생년월일로부터 사람의 나이를 어떻게 계산할 수 있습니까?

$from = new DateTime('1970-02-01');
$to   = new DateTime('today');
echo $from->diff($to)->y;

echo date_diff(date_create('1970-02-01'), date_create('today'))->y;

SELECT TIMESTAMPDIFF(YEAR, '1970-02-01', CURDATE()) AS age

$dnn = mysql_fetch_array($dn);
$birthDate = $dnn['date'];  // Fetch the birth date from the database

// Calculate age using the object oriented approach (assuming PHP version is >= 5.3.0)
$from = new DateTime($birthDate);
$to   = new DateTime('today');
$age = $from->diff($to)->y;

echo "{$age}";  // Output the calculated age