Reproducible manuscript for "No evidence that age affects different bilingual learner groups differently: Rebuttal to van der Slik, Schepens, Bongaerts, and van Hout (2021)"

Hartshorne, Tenenbaum, and Pinker (2018, A critical period for second language acquisition: Evidence from 2/3 million English speakers. *Cognition*, 117, 263-277) presented the first direct estimate of how the ability to learn the syntax of a second language changes with age. Recently, van der Slik, Schepens, Bongaerts, and van Hout (2021, Critical period claim revisited: Reanalysis of Hartshorne, Tenenbaum, and Pinker (2018) suggests steady decline and learner-type differences. *Language* *Learning*) reported that Hartshorne et al's (2018) model provided different results when applied to subsets of the data (e.g., only monolinguals), which they take to be a refutation of the original results. While the questions raised by van der Slik et al (2021) are interesting and important, their conclusions are based on a misinterpretation of incorrectly performed analyses. After correcting these mistakes, their proposed analyses strongly confirm the original conclusions of Hartshorne and colleagues.