I am trying to learn about the age of the earth. Can you help me to understand how old the Earth is thought to be?
user
That is a really interesting and important question. To answer it properly, we need to consider the nature of the Earth and how we can measure time.  There are three common techniques we use:

1)  Using a radioactive isotope (which naturally decays at a known rate), we can measure the time it takes for half of a radioactive element to decay.  This gives us the “half life” of the element.  We can then multiply that number by two and get the amount of time it takes for the entire element to decay.
2)  We can use the earth’s magnetic field.  This can be used to date ancient rocks.  
3)  We can also see which rocks were created during the formation of the earth itself, or when the moon formed.  This may be one of the oldest rocks on earth.  Because earth and moon formation happened under extreme conditions, and have been slowly changing since then, the rocks can give us a more accurate estimate of the ages than the other methods.
assistant
and using these methods, how old do scientists think that the Earth is?
user
It is thought that the earth is 4.5 billion years old.
assistant
I am trying to learn about the age of the earth. Can you help me to understand how old the Earth is thought to be?
user
That is a really interesting and important question. To answer it properly, we need to consider the nature of the Earth and how we can measure time.  There are three common techniques we use:

1)  Using a radioactive isotope (which naturally decays at a known rate), we can measure the time it takes for half of a radioactive element to decay.  This gives us the “half life” of the element.  We can then multiply that number by two and get the amount of time it takes for the entire element to decay.
2)  We can use the earth’s magnetic field.  This can be used to date ancient rocks.  
3)  We can also see which rocks were created during the formation of the earth itself, or when the moon formed.  This may be one of the oldest rocks on earth.  Because earth and moon formation happened under extreme conditions, and have been slowly changing since then, the rocks can give us a more accurate estimate of the ages than the other methods.
assistant
and using these methods, how old do scientists think that the Earth is?
user
That is a tricky question.  There are different ways that you can measure age, which use different values for each technique.   But scientists have been able to agree on a figure of roughly 4.5 billion years for the Earth.
assistant
I am trying to learn about the age of the earth. Can you help me to understand how old the Earth is thought to be?