- Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
- 51 years
<?php
$now = new DateTime();
$birthday = new DateTime('1973-04-18 09:48:00');
echo $now->diff($birthday)->format('%y years'); // 49 years