Can you tell the age of a starfish by the size of its arms?

No, you cannot determine the age of a starfish by the size of its arms. Unlike many animals, starfish do not have a centralized brain or a set of rings on their arms that can be used to estimate their age. Starfish actually have the ability to regrow their arms if they lose them, so their size is not a reliable indicator of age.

Instead, scientists use a variety of methods to estimate the age of a starfish, including counting the growth rings on their ossicles (small, bony structures in their arms), measuring their size and weight, and using radiocarbon dating to analyze their tissues. However, none of these methods are foolproof, and determining the age of a starfish can be difficult and imprecise.