The maximum time in seconds that this string may be cached.
Let's say the time difference is 1 day 1 hour. In this case, we can cache it until now + 1 hour, so maxAge is 3600 seconds.
Type: int
protected $maxAge;
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Datetime!FormattedDateDiff.php/property/FormattedDateDiff::maxAge/8.1.x