Approximate age of cow teeth?

[hporter]

Hi all, 

The subject of these photos may not be very interesting--I assume they are cow teeth (though do tell me if I'm wrong). But I am curious about the approximate age. I found these along the north shore of the Thames in London at low tide. Any thoughts would be greatly appreciated!

 

Thanks,

H

[Harry Pristis]

There were butcheries along the Thames for a thousand years.  Show us your mudlarking bottle finds.