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Specifically, the existence of *decay-derived lead* and the reasoning above proves the universe is older than 4000 years. But to believe that, you have to believe that we can observe things and draw conclusions about how they work.

We also have fusion-derived lead, and we have observed how star formation works, so we know thats this means our solar system comes from matter created by a supernova. But to believe that, you have to believe that we can observe things and draw conclusions about how they work.

Any young-Earth creationist like Ken Ham has to believe that God put starlight out there 4000 years ago, starlight that only *looks* like it has been traveling for billions of years from stars billions of light-years away.

These people do not believe that you can observe things, measure things and draw conclusions, so any effort to convince them with this form of argument is wasted effort. There is no "gotcha" big enough to turn their dogma off.