While Darwin's Theory covers evolution it has undergone a pretty extensive evolution itself.  Other supporting ideas have been added to prop his concept up.  His ideas are slight tweaks on ancient Greek teachings by Aristotle, Anaximander, Pliny, ect.  A theory is subject to being disproven, but when evolution hits a roadblock it just expands the timeline.  A complete look at a Historical Timeline we can show us how the theory changed over time to become what it is today. In fact, Darwin's Theory is what helps scientist determine the age of the Earth while Darwin's theory(today's version) points to the age of the Earth as a piece of evidence supporting it.  It is called circular reasoning. The most important thing you need to understand is the origin of the Earth and Evolution are not science.  By their own admission it is impossible to observe them.  These ideas are a belief system no different from a religious belief in a deity creating things.

Follow the timeline at https://historicaltimelines.blogspot.com/2020/02/the-evolution-of-evolution-and-origin.html