Ummm iPhones become obsolete as well. I have no problems with any of my Android apps.
Sounds like this phone may have gotten some malware. May want to consider backing up data and doing a factory reset, then reloading apps.
I do have an IPad 2 and there has not been an IOS update that hasn’t installed and it works perfectly. The lap/desktops do age out, my wife has experience with that.