Our present living world is around 6K years of age. The planet viewed as a collection of rocks is older than that, but not tens of millions or billions of years old. Robert Bass once redid Lord Kelvin's heat equations for the planet and included a maximal figure for radioactive elements, and got an upper bound for age of around 200M years.
Huh, aren't you contradicting yourself saying it isn't tens of millions or billions of years old and citing as evidence a study that gives evidence of the 200 million year old range? At that, later recalculations of Kelvin's analysis has actually increased the maximal figure, not decreased it.
http://www.uh.edu/engines/epi144.htm
Flash! Lord Kelvin proves that one can be smart and wrong at the same time.
Could you provide a source for Bass’ argument?