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The Earth is 4.54 billion years old; 3.8 billion years ago, the very first life form came into existence; 225 million years ago, dinosaurs came on the scene; and man took his first steps in Africa 200,000 years ago. In 1960, Willard Libby won a Nobel Prize for developing this technology. One of the ways that researchers measure the age of organic material is through carbon-14 dating.And radioisotope dating may be one of the more sophisticated methods we use to know the age of fossils, but it's not the only one.
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And the C14 in the organism's tissues starts to decay at a precise speed, but the amount of carbon-12 stays the same, since it's not radioactive.
Trace amounts of C14 make up a tiny percentage of that carbon dioxide, and it's integrated into the tissues of the organism.
Then creatures that can't make their own food through photosynthesis (like us) eat the ones that can, and that C14 is taken into our bodies as well.
Critics also like to point out that over time, the amount of C14 in the Earth's atmosphere may have varied.
But scientists know this, so they make corresponding adjustments to their measurements.