Age of the Earth over Time

Source	Date	Age of the Earth
Mayan Calendar	1	3642
Josephus	100	5655
Bede	735	4687
Alfonso X	1200	8184
Martin Luther	1550	5511
Joseph Scaliger	1583	5532
Johannes Kepler	1615	5607
John Lightfoot	1645	5574
James Ussher	1656	5660
Isaac Newton	1728	5728
Comte du Buffon	1779	75000
Hermann von Helmholtz	1856	22000000
John Phillips	1860	96000000
Lord Kelvin	1862	100000000
John Joly	1889	90000000
Simon Newcomb	1892	18000000
George Darwin	1895	56000000
John Perry	1895	3000000000
John Joly	1900	100000000
Bertram Boltwood	1905	1300000000
Arthur Holmes	1911	1600000000
C. C. Patterson	1956	4550000000