Radiometric dating is well established as a method for determining the age of rocks. There are many different techniques for radiometric dating.
In the Miami University Science library alone, there are over 30 books on Radiometric Dating.
One, just one of the 30 books on Radiometric Dating is titled Nuclear Dating Methods .
Below, I present The Table of Contents from that book to reinforce the idea that Radiometric Dating is an established fundamental principle of Physics and Chemistry and that there are many ways of measuring age within the Radiometric Dating paradyme.
To reject the fact that the earth is 4.5 Billion years old, you have to prove that all the methods identified in this Table of Contents produce invalid results. You have to prove that all the people who developed each one of these techniques, got it wrong. You have to research the other 29 books in Miami's library to prove wrong those techniques that appear in those books too.
Then go to all the research libraries in the world and make sure you have proven wrong all the research on Radiometric Dating.
More than one method of radiometric dating is used to make any age determination.