On Sep 6 2018, Magento published a blog ‘Supporting Magento 1 through Jun 2020’, in which it mentioned that it will stop supporting Magento through 2020.
Here’s what they had to say.
“For Magento Commerce 1 (Enterprise), we are providing software support through June 2020. Depending on your version, software support may include both quality fixes and security patches.”
“For Magento Open Source 1 (Community), we are providing software security patches through June 2020 to ensure those sites remain secure and compliant.”
The blog also clearly states – ‘While we’re committed to supporting the success of all merchants, the time to upgrade to Magento Commerce 2 is now’.