Your ignorant opinion about what's scientific is noted. As usual we've discussed that at length and you ignored that.
But I'll play your game this time. Multiple independent radiometric dating methods give the same results. They are independent because they use different isotopes that decay in different ways (there are three very different types of radioactive decay and lots of different subtypes) and use very different methods of analysis. We understand the physics very well. The phenomena of radioactive decay involve such fundamental properties of the universe that any change in the past would leave easily detectable repercussions today. Lots of people have looked. None of those repercussions exist.
The Earth is 4.5 billion years old, and life is close to that old.
Edited by JonF, : No reason given.