PHP と MySQL を使用して生年月日から人の年齢を計算するにはどうすればよいですか?

$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