Windows 8.1 reached the end of Mainstream Support on January 9, 2018, and will reach end of Extended Support on January 10, 2023. With the general availability of Windows 8.1, customers on Windows 8 had until January 12, 2016, to move to Windows 8.1 to remain supported.
I guess we will have to continue the never ending US product lifetime scam plaguing our world. How much can they really keep adding to it?