[ let's just say that for all comments under this tl that robin has cat ears and a tail due to a date, dwrp time is fake ]

A thousand year old mya~nakete will appear roughly equivalent in age, physically, to a child or teenaged human. There's some variation, but that's the scale you're working with.

Though half-blooded ones do seem to age significantly meow-re like their other prrr~arent.

[ fire emblem! ]