I wonder;
When I think of the word and concept of 'tradition', I'm travelling some years back
A tradition in MY family is at least a hundred years old.
How far back, do you suppose, Paul was going when he spoke of "traditions" ?
Re 11, why does it matter how far back the tradition went ? Paul was the Apostle to the Gentiles, and whatever tradition he taught the you can rely on. The issue is what traditions did he teach that are not recorded in his surviving writings, and how can we know.