This changes often actually depending on the universe I'm writing them in! While the both of them are always adults, Cupid is anywhere between 18-25 and Shanako is 24-29.

I'm not into super big age gaps personally, but Shanako is supposed to be a little bit older and wiser than Cupid, who's a young girl in her 20s and doesn't know what shes doing half the time (shes just like me frfr)