#personally i am torn

Boss monster do not age if they have neither parents nor children. 

But do their fingernails still need to be clipped, does Toriel still grow and shed fur, and does Asgore still need to cut his hair. 

Or are they just in something like a stasis. 

Discuss. 

(We will not be citing Deltarune lore as evidence because Asriel is still alive, so they are aging and do definitely grow and shed fur.)