In 1977 Rav Moshe Feinstein was asked (Igros Mosher YD 3:75) whether the Bnei Torah in Sunderland, England should send their sons to the Gateshead Cheider where the entire parent body are Bnei Torah and the learning was on a higher level, or they should keep them in Sunderland because if the Bnei Torah all send to Gateshead, the Sunderland Cheider will fall apart.
Rav Moshe answered that he believes that the boys under seven years old should remain in Sunderland because the travel is hard for them and at that age it still won't be a very big difference as far as the learning is concerned. However after age seven when the lower level of learning will make a significant difference, and the type of friends they have play a large role in their Chinuch, the parents should send them to Gateshead and not sacrifice their children for the continued existence of the Sunderland Cheider.
With regard to girls, said Rav Moshe, they should stay in Sunderland until age nine, because their mother's influence is stronger than that of their companions. Additionally since the teachers are Yirei Shamayim and teach them properly, it is not crucial that they go to Gateshead just because the learning is even better.
Important Note: We bring this tshuvah as a starting point for discussion and not to convey any halacha. We try to convey the Tshuva to the best of our ability. We admit that our understanding may not be accurate. One should learn the tshuva to verify the accuracy of our interpretation. Please understand that this Tshuva may not be the final word on this topic. One should consult a Rav before drawing any conclusions.