Maybe but there's been things implying Tewi was around since the BCs, making her older than anyone not Eirin.
Assuming she really is THE Hare of Inaba then she pre-dates the founding of the empire of Japan, making her no less than around 1,700 years old if looking at the historical records. If we go by the traditional founding dates instead she's even older, 2,500 years or so at a minimal.
Either way, she's one of the oldest characters.
Eirin, did you forget your track suit?I did not!It's hidden again!Jeez, Tewi-onee-chan is such a meanie!Then you can learn something from her, class rep...