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<?php $now = new DateTime(); $birthday = new DateTime('1973-04-18 09:48:00'); echo $now->diff($birthday)->format('%y years'); // 49 years
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

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