Some old and unsupported Samsung phones, including one that came out seven years back, have received a new update.
will get up to five years of security support and four operating system updates.
The oldest Galaxy phones that still receive monthly updates are 2019's Galaxy Fold and Galaxy Note10, and early 2020's Galaxy S10 Lite. Devices older than that, such as theand 2018's Galaxy Note 9 get quarterly updates, and a bunch of mid-tier devices released between 2018 and 2019 get biannual security updates. So, loosely speaking, the cutoff is 2018, though this mostly only applies to flagships.
If you are still using a device that in smartphone speak is ancient, you are living on the edge. Samsung rolled out an update for the discontinued and unsupported Galaxy S7 and S8 and 2015's Galaxy J7 some days back to fix GPS. A few days later, the Galaxy Note 8 also received a surprise update to help with GPS.