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I would just take a wild stab that sometime between 9-13. Of course I didn't grow after 13..... You could probably guess early in childhood and decide in teenage years. I looked like a Hunter in at 8-9 years old.
SWAMI O+ Gatherer, Healing from Fibromyalgia Kyosha Nim Columnists and Bloggers
Location: New York
I didn't measure DD1 for genotype until she had pretty much stopped growing. Even though she measured out for Gatherer, she decided to stick with the BTD anyway. She's getting a SWAMI in about 2 weeks, at which point she'll follow that rather than any of the "book diets."
DD2 has expressed interest in being measured for SWAMI, so I'll probably measure her sometime in the next few days or weeks. I'll probably keep her on BTD anyway; the measuring is just for curiosity's sake. I hope to get her a SWAMI around age 16 or 17, once I'm pretty sure she's done growing. I think the GT measurements should be fairly accurate, since she's 15 and close to her adult height.
A lot depends on how the measurments turn out. Torso 4 inches longer than legs and she's likely to grow another 2 inches or less? I'd say the ratio won't change. But if her torso is only 1/2" longer, when she may grow another 2 inches? Then I'd say she's too young to know for sure.
My "Mama intuition" tells me she's an Explorer, but I could be wrong. That same intuition tells me DS is a Nomad, confirmed by a very casual measuring of his finger lengths. If I measured them correctly, then he's a Nomad no matter what the rest of his measurements turn out to be.
For now, I'm keeping him on the BTD, but incorporating some GTD beneficials that are neutral or better for BTD. I'm not cutting out any foods that are OK for B's but not for Nomads, but I'm trying to de-emphasize those foods. So, more yogurt and less milk, but I'm not completely cutting out unfermented milk. I'm not cutting out kidney beans (beneficial for Bs, black dot for nomads) and I'm not introducing lentils (avoid for Bs, beneficail for Nomads.) But I do want to start him on cod liver oil (diamond for nomads, neutral for Bs.) It certainly can't hurt him (it's at least neutral) but it may be very healing for him (it might be a diamond.)
Ruth, Single Mother to 22 yo O- Leah , 20 yo O- Hannah,and 15 yo B+ Jack