Four seems very young. It looks like brain development continues in a non-trivial way for a long time, and late adolescence (i.e. 15ish) is when IQs stabilize, if I remember the literature correctly.
Four seems very young. It looks like brain development continues in a non-trivial way for a long time, and late adolescence (i.e. 15ish) is when IQs stabilize, if I remember the literature correctly.