According to Gene Expression: Men average 4 to 5 IQ points higher than women.
“The generally listed “peak” age for scientific creativity and productivity is around the surprisingly young age range of 30-40, but the same exact age doesn’t apply to all scientific disciplines. The peak in fields that demand greater doses of pure reasoning, such as mathematics, theoretical physics, and molecular biology, appears to be somewhere in the twenties. So, for instance, James Watson discovered the double helix at 25 and then dropped off the radar as anything but a nerd celebrity. In contrast are fields such as evolutionary biology, where years of collecting and assimilating large amounts of data can be required for original analysis.”