While working for Apple, I regularly had people make the claim that Apple was somehow crippling its devices over time.
I currently have a co worker that believes this to be so true that she switched to Android phones.
I had a iPhone 5 that passed its third birthday and ran just as well as when I got it.
You have an older iOS device and it’s running slow?
Do these two things and you’ll be in business:
Hopefully you did step zero, which was save everything important somewhere else. Thanks to cloud services, I have to save pictures to my computer, and I can pull the trigger on this process at any time.