I have an original iPad (v1?) and a iPhone 3GS, neither of which can be upgraded and yet in both cases the battery is fine and they work Ok but with very out of

I have an original iPad (v1?) and a iPhone 3GS, neither of which can be upgraded and yet in both cases the battery is fine and they work Ok but with very out of date software which in turn means that I can't access even relatively benign web sites effectively.