I was thinking more about this...
So I could count the rings from end to end along the width of the table and get a minimum age of the tree the table top was sawn from, since the board was quarter-sawn. That would be interesting to know! I had assumed we were looking at a cross section (full width of the tree) until you posted the diagram showing what a quarter-sawn board is. think I'll do that, and will put a tape marker along the edge for every count of ten and take another photo.