Up to what age are girls allowed to pursue secular education?

Answer

The co-ed school is haraam. Girls and boys even 6 year old, may not attend a co-ed school. It is a haraam system. Hadhrat Thanvi (Rahmatullah alayh) said that a girl has to observe Purdah for strangers from the age of 6, and for ghair mahram relatives from the age of 7. Expanding on this opinion, we say that due to the predominance of fisq and fujoor in our era, girls should be kept away from males even from the age of 4.

A girl should never be sent for secular education even in an all-girls school even if she is 6 years old. Basic English should be taught at home.