James Hutton's published works estimated the age of the Earth to be at least millions of years, based on geological evidence in 1788. Darwin was born in 1809.
That should end the whole "we need an old Earth to support evolution" argument... Old-Earth theories not only pre-date the theory of evolution, they pre-date the birth of the postulator of the theory of evolution!
If it doesn't break that line of argument, then we have serious cognitive dissonance going on, and might as well just ignore the loonies on the path.