The method used to determine the age of an object through radioactive decay is known as radiometric dating. This technique relies on measuring the concentration of radioactive isotopes and their stable decay products within a sample. Different isotopes are used for dating various materials; for example, carbon-14 is commonly used for organic materials up to about 50,000 years old. Radiometric dating provides critical information about the timing of geological events, evolution, and archaeological findings, offering insights into the history of our planet and life on it.