"That is, the world looks old because IT IS old"
Why does the world look old?
"we don't see the sediments of a world-wide flood because there WASN'T one"
So massive horizontal worldwide sedimentation with essentially unidirectional paleocurrent indicators isn't indication of a world-wide flood?
"we find evidence for common descent of organisms because common descent IS the nature of the relationship"
Except that we usually don't. In cases where common descent is realistic, creationists agree (for example, Creationists agree with the common descent for basically all Canidae).
You: Why does the world look old?
Hello? Read it again, OK?
So massive horizontal worldwide sedimentation ...
Looks like a description of the geologic column. No way that's one great flood, no.
... with essentially unidirectional paleocurrent indicators isn't indication of a world-wide flood?
Looks like gibberish. "Unidirectional paleocurrents?"
Except that we usually don't.
"You" don't seem very reasonable.