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Sex differences in intelligence have been much disputed for many decades. The present study examined the issues of whether sex differences in intelligence change during development. In total, 11,164 children (mean age= 13.5 years; SD= 2.6 years) completed the Standard Progressive Matrices Plus (SPM+). From age 8 to 19 years, sex differences in the total score of the SPM+ increased from-0.06 d (favoring females) to 0.46 d (favoring males), with an average of 0.23 d. Our findings support Lynn’s developmental theory of sex differences in cognitive abilities.