I think it's more cutting edge but in light of what we're learning about the developing brain. The frontal cortex is critical for "focus" and yet it doesn't rea

I think it's more cutting edge but in light of what we're learning about the developing brain. The frontal cortex is critical for "focus" and yet it doesn't reach full maturation until 20-24 years old. We only know that, definitively, from brain scans which are still relatively new in developmental studies. And the longitudinal work just hasn't been done. Keep in mind though that "deficit" is usually judged within ages. So a young child isn't expected to have the same focus as an adult, just within the range of other children their age. Context also matters.