According to scientific evidence, the age of the earth is about 3.5 billion years old 4.6 billion years old 7.2 billion years old 2.3 billion years ol

Scientific experts have determined that the earth is about 4.6 billion years old. This scientific estimation was made be examining decay rates of specific radioisotopes found within fragments of a meteor within the Canyon Diablo. Specifically the radioactive decay of Uranium was compared to the relative abundances of other earth elements.