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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.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.