The standard for previous Windows versions had been Five years of full support, (new features and bug fixes), followed by a further five years of extended support,(bug Fixes only), That was the advertised plan though it was not often met.
We have been given an end of support date for Windows 10 of 2025, the thing we need to be aware of is is this the end of full support or the end of extended support. Under the old system the end of full support would have been during 2020 and the extended support would end five years later in 2025.
Of course we have already been told that there will be a full update 21H2 toward the end of this year, and we have been told that windows 10 will not be left behind, therefore if the rules are followed then the end of extended support would be late 2026 at the earliest so we are still in the dark as to what will happen to Windows 10
There is also the assumption being made that Windows 11 will be released in the last quarter of this year for the holiday period , however that would mean that the OEM manufacturers would need a woking release copy in the next month or two which is unlikely given the early Beta stage of the current software