Apple support for iPhone SE 2nd Generation

I am considering upgrading to an iPhone SE 2nd Generation, and need to know how much longer Apple will continue to support it. I have heard rumors that when iOS 15 comes out it will not upgrade on the iPhone SE 2nd Generation, is that true? I have also heard that Apple will support it for another 5 years, is that true. Can't seem to find answers to my questions on Apple.com.