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  • This one worked for me!

        $date = get_field('date_of_birth');
        $birthday = new DateTime($date);
        $interval = $birthday->diff(new DateTime);
        echo $interval->y.' years old';

    This one:

      //date in mm/dd/yyyy format; or it can be in other formats as well
      $birthDate = get_field('date_of_birth');
      //explode the date to get month, day and year
      $birthDate = explode("/", $birthDate);
      //get age from date or birthdate
      $age = (date("md", date("U", mktime(0, 0, 0, $birthDate[0], $birthDate[1], $birthDate[2]))) > date("md")
        ? ((date("Y") - $birthDate[2]))
        : (date("Y") - $birthDate[2]));
      echo "Age:" . $age;

    For some reason generated the current year. But no matter, I have it all working now, thanks!