Starting in 2020 Google Chromebooks will receive 8 years of support rather than the current 6 1/2 years

https://www.pcmag.com/news/google-promises-8-years-of-updates-for-new-chromebooks

Existing Chromebooks typically receive automatic software and security updates for 6.5 years after a model’s introduction. However, for 2020 and beyond all new Chromebooks are set to receive eight years of automatic updates. The two new Chromebooks Google uses as examples are the Lenovo 10e Chromebook Tablet and Acer Chromebook 712, both of which will receive updates until June 2028.