Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. As we age, our hair turns gray, our skin wrinkles and our gait slows.

There are different methods of radiometric dating that will vary due to the type of material that is being dated.

For example, uranium-lead dating can be used to find the age of a uranium-containing mineral.

So, you might say that the 'full-life' of a radioactive isotope ends when it has given off all of its radiation and reaches a point of being non-radioactive.

When the isotope is halfway to that point, it has reached its half-life.

This provides a built-in cross-check to more accurately determine the age of the sample.

Uranium is not the only isotope that can be used to date rocks; we do see additional methods of radiometric dating based on the decay of different isotopes.

The stately Heldreich's pine was discovered in an ancient grove among several other millennium-old trees in Italy's Pollino National Park, south of Naples.

[Gallery: The Oldest Living Things in the World] Italus, the oldest of the trees studied over a recent three-year survey, snags the title of Europe's oldest tree from the 1,077-year-old Bosnian pine known as Adonis, which was dated in Greece in 2016.

The uranium-235 to lead-207 decay series is marked by a half-life of 704 million years.

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