Hi Sam,
SharePoint 2013 exams retirement was scheduled to happen on 30th of Sept 2016. However it has been extended to March 2017.
https://absolute-sharepoint.com/2016/05/microsoft-delays-sharepoint-2013-mcsd-retirement.html
More over there wont be a replacement for SP 2013 exams, instead the SharePoint Server 2016 exam certification path is being updated. Microsoft has released the exam 70-339(Managing Microsoft SharePoint Server 2016) as part of it.
https://absolute-sharepoint.com/2016/05/microsoft-releases-sharepoint-2016-mcse-information.html
https://www.microsoft.com/en-us/learning/exam-70-339.aspx
Thanks,
Priyan
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