Here’s some redemption for all the little girls who were told they weren’t tough enough to play sports with the boys: The sexes are equally matched. A new study says so. So nah-nah-nah-nah-nah.

According to a news release from Indiana University, researchers at the school analyzed USA Swimming data of top 50-yard freestyle times from female and male swimmers ages six to 19. For kids younger than eight, there was no difference in performance between the genders. For those ages 11 and 12, there was little difference. It wasn’t until age 13 that boys—getting taller and stronger—started to outperform the girls.

“It’s the whole perception that girls can’t compete fairly with boys,” researcher Joel Stager, a professor in the School of Health, Physical Education and Recreation at IU Bloomington, says in the release. “Well, at certain ages, they can.”

You go, girls!

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