https://www.quora.com/How-do-biologists-tell-the-age-of-a-whale https://www.quora.com/How-do-biologists-tell-the-age-of-a-wh... Quick and dirty: size is a pret

https://www.quora.com/How-do-biologists-tell-the-age-of-a-whale https://www.quora.com/How-do-biologists-tell-the-age-of-a-wh... Quick and dirty: size is a pretty good indicator to approximate, but if you've got yourself a dead whale you can check the bones to get a better number.