Microsoft still supports Windows 7. Support for XP ended in April of 2014. Support for Windows 7 will continue until January of 2020. Currently, Microsoft offers support for operating systems for 10 years from the time they are made available to the general public. XP support was extended three years beyond that time.
Windows Vista will be supported until April of 2017 and the end date for Windows 8 support is January of 2023.