MacOS

The first year to use Monterey is 2015; BS is the latest you can use.

macOS Monterey compatibility

macOS Monterey was made available to download on October 15, 2021, and the most recent version is macOS 12.6.5. The following Macs are compatible with macOS Monterey:

• MacBook Air models from early 2015 or later
• MacBook Pro models from early 2015 or later
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macOS Big Sur compatibility

macOS 11 Big Sur was the version of macOS that arrived on November 12, 2020, and the latest version is macOS 11.7.6. Here’s a list of the Macs that can run macOS Big Sur:

• MacBook Air models from 2013 or later
• MacBook Pro models from 2013 or later

Correct. But Apple is not picking on your model, sooner or later all models reach the end of OS upgradeability.