Asuramaru1220
With the way I was approaching Alvitr I felt like I was inputting my own headcanon of her age to be canon so I apologize on that. Her exact ‘ human’ age is not confirmed, her age is listed as being 1000* like most of her Valkyrie sisters but there isn’t a direct equivalent to what she would be as a human equivalent. In my interpretation she’s a teenager ( older) with her triplets. Youngest I’m thinking they could be is 15.. but honestly she could ( Alvitr) be a young adult with how she acts more maturely than her other younger sisters. To me my own interpretation is she and her the rest of the 2 triplets are older teens maybe 16-17.