The obligation of one who has reached the age of eleven but did not fast until the age of fifteen

Question:
May Allah reward you and may He reward you with good. One of the female listeners did not mention her name or a symbol for it. She says: I am a girl who started menstruating at exactly eleven years of age, but I did not fast Ramadan until I was fifteen. I did not know that it was obligatory for me to fast at that age, meaning when I reached puberty, because my family says that fasting is not obligatory until the age of fifteen, as they heard this from people. They do not know that it is obligatory for me to fast when I start menstruating. After several years had passed, I heard that I must fast for a number of hours. My question has several aspects, the first of which is: What is obligatory for me to do? Do I fast or do I give charity? If I must fast, how much do I fast? Thirty days or twenty-nine days? If I must fast and give charity for every day, what is the amount I give? Do I give charity on the same day or for the whole month? Is it permissible to give charity to non-Muslims? She says: Honorable Shaykh, in her first question, what is obligatory for me?

Answer:
Yes, what this questioner mentioned is a great error on the part of the guardians of the girls. They neglect to alert them to what is obligatory for them upon reaching puberty. This is a great negligence on the part of the guardians, and it is even worse if they tell her that nothing is obligatory for her until the age of fifteen. This is one of the greatest errors. In fact, the commands of religion become obligatory for a minor when he or she reaches puberty. The last of the signs of puberty is reaching the age of fifteen. Otherwise, one may reach puberty before that through the occurrence of menstruation for a girl, or the emission of semen for a male or female, or the growth of hair around the private parts for a male or female. All of these are signs of puberty. In any case, it is obligatory for guardians to be attentive to their children upon reaching puberty and to command them to do what is obligatory for them. As for what happened to this questioner, where several years have passed since she started menstruating and she did not fast, and she did not start fasting from the age of fifteen, this is a great error. She must make up the months she left. She must fast thirty days for every month, fasting thirty days by count. She must feed a poor person from among the poor Muslims for every day, not from among the disbelievers, but from among the poor Muslims. The amount she pays for each day is one and a half kilograms of the staple food in the country. Yes.