I am not sure the chronologies in the Bible haven’t left out some of the people....so I think it is not wrong to a add a few years...after all...if some of those men lived to be 8-9 hundred years, and their name as skipped...that could add a few thousand years....if the earth was significantly altered during the flood that would render calculating the age of the earth by stratification layers or rock characteristics like concentration of radioactive daughter elements to be a potentially error prone system.
I just read that a star cluster was located in the milky way galaxy that is estimated to be about 13 billion years old. Close to the age of the universe. Why isn’t the cluster at the edge of the universe? Our cosmological understanding may be very incomplete. Even deGrasse Tyson thinks the whole universe is a simulation....so that means everything we discover is possibly capricious conjecture. Wow.
What will deGrasse Tyson do when he discovers who is running the simulation? ;-) If he means all of creation is held in the mind of God, and without Him we are nothing, I might go along with him a bit.