ggibson913
macrumors 65816
Defining "usable life" as continuing to receive Operating System/ Security updatesI'm sitting here in my living room with an iPhone 3GS, an iPhone 4, an iPhone 4s, an iPhone 5, an iPhone 6s and an iPhone 6s+. All of which work. PS, my daughter uses an iPhone 5 on an active line as her primary phone.
I think you may need to revise your max useable life criteria for the iPhone. 😉
Also, right next to my Android phone is my 2009 HTC Touch Pro. Granted, it's WinMo and not Android, but it is 11 years old and still functioning.