Inkwell_Obsidia said: ... she doesn't even look older than Childe in her current appearance
Considering that Abyss's time flows significantly slower than the Teyvat one... She used to train Tortellini for three months, and when he came back to the surface he figured out that only three days had passed. And as she mentioned she spent most of her life down in the abyss. She's as minimum as 200-250 years.