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The Earth is believed to be between 4.4-4.6 billion years old.

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Scientists have developed a variety of methods to determine the earth's age

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Fossils can be identified and dated to help determine how old the rock they rest in is.

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Put simply, the rocks at the bottom are older than the rocks on top. However it can be difficult to determine the age of these rocks from this method alone.

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Scientists can measure the radioactive decay of elements in rocks to determine how old they are. In particular scientists measure the decay of Carbon, Uranium, and Potassium.

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http://www.dnr.louisiana.gov/assets/TAD/education/BGBB/1/measuring.html
https://geomaps.wr.usgs.gov/parks/gtime/ageofearth.html