Gilbert de Brionne comte d'Eu - Had child at 6 years old. Is this correct? If so, then some kind of record?

Gilbert de Brionne comte d'Eu had 1 child between the ages of 6 and 15 years old.
Tip: Request that the manager correct the birth date of Gilbert de Brionne comte d'Eu or the following child:
Adèle de Brionne, comtesse d'Eu

He's all locked up so he can't be tweaked. But Anjou isn't in the Alps, and the coat of arms is Fitzwilliam of Sprotborough, who weren't even descendants. Nobody had a coat of arms in Count Gilbert's time.

I don't suppose there are any known dates for Adele. But her brother was a contemporary of the Conqueror and her husband died in 1092. So the dates here are way too early.

Thank you Brian Johnson .