Yes, the latest version released until April 2016 will continue to work on Windows XP PRO, OSX 10.7 and OSX 10.8 (from Apple), but after the April 2016 updates won't be released anymore which means you will be at risk when visiting websites because malware could get installed on your PC through it.
If there is no way for you to upgrade to a newer OS, at least install a powerful antivirus to keep you protected: http://software.informer.com/search/antivirus
