she's gonna be around 22 so looking at their ages, i can say camden lied about her age wherever she and max met and never told him the truth about it ("it never came up!") which makes it even more awkward when it's found out, but these two could have either been roomies, hiking and weed buddies, they met somehow and when camden went to grace's yoga class, she recognized her? she's definitely the type that would walk up to someone and strike up a conversation, especially in a, "don't i know you from somewhere?" situation and they could have stayed close ever since?