Can you cite a source for those figures?
"The Moon formed 4.51 billion years ago, or even 100 million years earlier, some 50 million years after the origin of the Solar System, as research published in 2019 suggests."
-Wikipedia
Regards,
I imagine the source can be found wherever they dated the surface dust (older) and the rocks (younger). Perhaps NASA or some independent labs. You’ll have to look around on your own - sorry to inconvenience you with doing your own research.