Anyone using older Apple devices that are no longer supported, including iPhones, Macs, Apple Watch and Apple TV, will no longer be able to use Apple services like the App Store, Siri and Maps.
This information is from StellaFudge which he claimed Apple services are not accessible on older devices running iOS 11-11.2.6, macOS 10.13-10.13.3, watchOS 4-4.2.3, and tvOS 11-11.2.6 when combined with the information in the support documentation. Apple has confirmed that some older software versions will not support some Apple services, such as the App Store, Siri and Maps, although Apple has not provided details. Just saying that users of older devices will be notified when the time is right.
The software version mentioned by StellaFudge, some devices can also be updated to a newer version. In addition to that, most Apple users tend to update their operating systems to newer versions. Because there are bug fixes and security. According to Apple’s latest data released on February 14, 2023, 72% of iPhone users have updated to iOS 16, 20% of users are still using iOS 15, and 8% are using a version earlier than iOS15.
If your device is unable to update the operating system It should be time to change to a new model. because there will be a security system that is tighter to prevent new attacks and threats from emerging
Source https://mashable.com/article/apple-devices-old-software-access-app-store