If you use Chrome on an older operating system, your browser could stop getting updates in just a few months. Google's official Chrome Blog announced that it will be ending support for Windows XP, Windows Vista, and Mac OS X 10.6, 10.7, and 10.8 in April 2016. Chrome browsers on those operating systems will continue to work, but they will stop getting updates from Google.
For Windows XP, this is yet another stay of execution from Google, mirroring Microsoft's continually extended support for the OS that just won't die. Chrome support for XP was originally stated to end along with Microsoft's support in April 2014. Google then extended the support to "at least April 2015," then all of 2015, and now the browser is going to hang around for the next five months.
On the Mac side of things, Apple usually supports its three newest operating systems. So official support for 10.8 ended when 10.11 El Capitan was released, and 10.6 and 10.7 have long been put to rest by Apple.
The only currently-supported operating system that Google is abandoning is Windows Vista, which still has extended support from Microsoft until April 2017.
If you're on any of these old, insecure operating systems, it's probably a good time to upgrade. May we suggest Windows 10 or Mac OS 10.11?