Well, pete...if you 'suppose' you could be missing something, why not examine the entire argument...all sides of it?

The point about rock dating is that SOME rocks and/or minerals are clearly many millions of years old. This is proven beyond any reasonable doubt. The age of proven materials, combined with other scientific data shows us that 'life' is pretty old, and that we humans are a fairly recent developement....not thousands of years old, but several million. In terms of proven ages of other stuff, that IS recent.