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The answer of 25 million years deduced by Kelvin was not received favorably by geologists.Both the physical geologists and paleontologists could point to evidence that much more time was needed to produce what they saw in the stratigraphic and fossil records.The solar estimate was based on the idea that the energy supply for the solar radioactive flux is gravitational contraction.These two independent and agreeing dating methods for of the age of two primary members of the solar system formed a strong case for the correctness of his answer within the scientific community.When asked for your age, it's likely you won't slip (with the exception of a recent birthday mistake).
Before so-called radiometric dating, Earth's age was anybody's guess.
The study of geology grew out of field studies associated with mining and engineering during the sixteenth to nineteenth centuries.
In these early studies the order of sedimentary rocks and structures were used to date geologic time periods and events in a relative way.
Of course, Kelvin formed his estimates of the age of the Sun without the knowledge of fusion as the true energy source of the Sun.
Without this knowledge, he argued that, “As for the future, we may say, with equal certainty, that inhabitants of the Earth cannot continue to enjoy the light and heat essential to their life, for many million years longer, unless sources now unknown to us are prepared in the great storehouse of creation.” This last statement was prophetic.