For one, the notion of "aging" in this context can be quite complex. What specific metrics were used to determine this accelerated aging? It would be beneficial to look into whether the researchers controlled for various factors, such as stress levels, socio-economic conditions, and the differing ways boys and girls coped with the pandemic.
Moreover, how representative was the sample used in the study? If the sample size was small or not diverse, it could skew the results and lead to overgeneralizations.