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No action is required on your end as this new field in the Verity response is not a breaking change, but an enhancement that provides insight into the age of each classification.
Please refer to the below Verity API Page Analysis Integration Guide excerpt for more information on Stored Page Responses and how to ignore a stored page response, if desired.
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When Verity receives a page classification request, Verity checks if the results for the URL are in the Verity database. If results are in the database, Verity retrieves the results and returns them in the JSON response by default. If results are not in the Verity database, Verity initiates a new page classification request. Optionally, clients can bypass the stored response. To reprocess a stored page classification, append an optional ignoreCacheoptional ignoreCache=true flag true flag to the end of a GET request. Verity reprocesses the page URL right away and updates any stored response.