Also, we could be way off on the age because we just don’t know. Sure, we can collect data and extrapolate for billions of years and assume that all elements have always decayed at the same rate, but short of living through it and accurately measuring it with modern instruments, molecules-to-man “macro” evolution can’t actually be proven.

This is why, using the Scientific Method, it is still a theory. A theory accepted by most scientists, but still. There’s a certain arrogance in declaring solved something we can’t actually know for 100% certainty.