One method for getting the age of the shark involves the eye lenses - of a dead shark. This 393 year shark was the oldest living thing. (In other words it’s dead.)
They eat them in Iceland. Traditionally buried in the soil to rot for a while. Apparently they taste of ammonia. Disgusting.
No more disgusting than the then rotten white fluid extracted from hairy animals mammary gland, called cheese in america. Even without eating anything, each of us drink several litters of his own saliva every day.
Amusing, but most people don't have to follow eating cheese with a shot of 80 proof liquor just to keep it down.
In france my country we drink lot of wine with our cheese !
I smelled some little shark-ettes [dog fish] on the dock once and they had a very strong ammonia smell. If I remember correctly, sharks “pee” through their skin.