Quote Originally Posted by Denji View Post
aren't they technically like in their mid-20s now. like, 16 in arr and then hw, sb, shb, ew... yeah like literally 25 because of their time on the first.
There is no defined timeline for the expansions. The devs have stated that they are deliberately not progressing time or having the characters age up, even though logically more than a year has passed by now.

Until they say otherwise, the twins are permanently 16; mentally 17 from a year spent in the First.