It's good to know that in the billions of years (according to evolutionists) that the Earth has been in existence, we've finally nailed it down! I'd like to see what they're saying in another 50 years.
It is impressive isn't it? Except I expect you are being sarcastic. Tell me, would you rather scientists *hadn't* worked out how old the earth is, to a high degree of reliability, with now several different correlating measurements? I guess you wish they hadn't, because the answer upsets your religious sensibilities. Tough.