The average IQ of first-born men is 103.2. Second-born men average 101.2.

I wonder what the senior female IQ is?

A male first-born sent this:

Boys at the top of the pecking order - either by birth or because their older siblings died - score higher on IQ tests than their younger brothers. The question of whether firstborn and only children are really smarter than those who come along later has been hotly debated for more than a century.

Norwegian researchers now report that it isn't a matter of being born first, but growing up the senior child, that seems to result in the higher IQ scores.

[senior] [boys] [psychology] [IQ] [first born] [Norway]