The S6 was released in April 2015. The device has had its time out in the sun but that is at an end, with Samsung officially ending support for the device. The S6 Edge, S6 Active, and S6 Edge+ also get the same treatment, with the Note 5 set to follow in a few months.
https://www.notebookcheck.net/The-Samsung-Galaxy-S6-flagships-say-So-long-and-thanks-for-all-the-fish.294452.0.html