You are given a sentence in Galician. Your job is to translate the Galician sentence into English.

As frechas sinalan o pico de volume de materia gris no córtex prefrontal. Os nenos acadan o pico un par de anos máis tarde cás nenas, probablemente porque, de media, acadan a puberdade un par de anos máis tarde ca elas. E durante a adolescencia hai un declive significativo no volume de materia gris no córtex prefrontal.
The arrows indicate peak gray matter volume in prefrontal cortex. You can see that that peak happens a couple of years later in boys relative to girls, and that's probably because boys go through puberty a couple of years later than girls on average, and then during adolescence, there's a significant decline in gray matter volume in prefrontal cortex.