It takes approximately 225 Million years for our solar system to make one revolution around the Milky Way Galaxy.
But this is extrapolation from appearances, is it not? What knowledge do we have that such a revolution has ever actually occurred, or will actually occur?
And such demurrals are on a par with the denial of the primordial significance of the observed CBR, so I don't see where you're coming from.
Are you saying that our galaxy must be at least several hundred million years old, so as to have accomplished a revolution or two, as it seems to be in the process of doing? But that the universe itself was only created who knows when, the CBR notwithstanding?