Our current platform, Magento Community Edition 1.9, is slated to receive security patches until June of 2020, according to the documentation on Magento’s website
https://magento.com/blog/magento-news/supporting-magento-1-through-june-2020 https://magento.com/sites/default/files/magento-open-source-software-maintenance-policy.pdf
I have heard from alternate sources that Magento CE 1.9 will only be supported until October of this year (though I find that highly suspect). Secondly, what would a transition to a Magento Open Source 2.x version look like down the road when 1.9 eventually reaches end of support?