End of Life? End of Support? End of Security Updates?
Where can I find a road map from Apple that discloses whether or not Apple has ended security update support for past products, and when Apple projects to end security update support for current products?
I will give some specific device examples, following the suggestions of "how to write a good question", but shouldn't there be a perpetually accessible page on Apple's Support website whereby End of Life or End of Support information is available for consumers and businesses alike to refer to on a continual basis in order to budget for equipment replacement to meet security concerns when otherwise perfectly working equipment is no longer supported?
After an hour of searching, no clear and definitive resource has yet emerged. A few press releases picked up by news articles from years ago, where the thrust of the article was the announcment of new product. And again, from years ago is not helpful going forward. Much of those articles is laden with prognostications from pundits, which history proved inaccurate.
I am looking for answers straight from Apple on what Apple still supports, and what Apple no longer supports. What is safe to continue to use on the internet, and what is no longer safe. Microsoft is very clear on this. They clearly identify the end of mainstream support, and the end of security support, for each of their operating systems. I would like this information for Apple hardware as well as Apple operating systems, since earlier Apple hardware may not be compatible with current Apple software.
Examples devices I would like to know the end of security support for include, but are not limited to:
Current Devices:
iPhoneSE (several years old, first year model, currently running iOS 11.4). How long will security support be made available for this device?
Older Devices:
IPadAir
IPad2
iPhone5c
iPhone4s
iTouch4
MacBookPro (the last model with a user exchangable battery)
I'd rather not have to join a forum just to ask this question again in a few years, when devices are replaced. Isn't there a page where Apple informs consumers of the company's support plans and current status of past products?