The earth’s magnetosphere protects the earth from harmful radiation. The magnetosphere is known to be decreasing in strength at a rate of about 5% per century. If the earth were more that about 10K to 20K years old, the magnetosphere would be too strong to allow life on earth.
The uniformitarian assumption of the decay of the magnetosphere directly leads to a younger-earth result. I am unaware of any old-earth refutation of these facts.
https://www.science.org/content/article/earths-waning-magnet