On January 14th, 2020, Windows 7 will reach End of Life, which means that unless you purchased Extended Security Updates licenses, Microsoft will no longer provide vulnerability or bug fixes for the operating system. Google has stated that they will continue to support Chrome on Windows 7 through at least July 15th, 2021. This means that many businesses will still be able to use Windows 7 even after it has reached end of Life and no longer receives critical security updates. This allows for a seamless migration when users ultimately upgrade their machines to a newer version of Windows.
Source: https://www.bleepingcomputer.com/news/google/google-chrome-will-support-windows-7-after-end-of-life/