What Is The ruling on having long hair for men and short hair for women?

This question includes two issues: The first: with regard to men lengthening their hair. And the second: with regard to women shortening their hair.   As for the first issue, the principle ruling is that there is no problem in lengthening the hair of the head, as the Prophet ﷺ used to have hair that sometimes came to his shoulders. So, in principle, there's nothing wrong with it, but nevertheless this goes back to the habits and customs. So, if customs and habits show that this thing is only done by a certain part of the community who are considered lowly in people’s customs and dignity, then is not befitting for dignified/honorable people to do it (e.g., lengthening their hair) because in the habits and customs of the people, only those of a low status do it. So, the issue regarding a man lengthening his hair is from the originally permissible things that go back to people’s customs and habits. If it becomes customary for all people, the honorable and the lowly, then it's ok.   But if it is only done by the lowly people, then it is not befitting for people of honor and prestige to do it. And this ruling is not contradicted by the fact that the Prophet ﷺ, who is the greatest of people and the most honorable and prestigious, had long hair. Because with regard to this issue, we hold that having long hair isn't a matter of Sunnah and worship, but rather it’s a matter of following customs and habits. This is with regard to the first issue in the question.   As for the second issue, which is the shortening of the woman’s hair, it is not permissible if it is in a manner that resembles the heads of men. Or it resembles the heads of the disbelieving women, or prostitutes, or similar people who are impermissible to imitate. But if the shortening is free from that, then scholars have three opinions regarding it. Some of them deem it absolutely impermissible for a woman to cut her hair except in Hajj or ‘Umrah. And some of them deem it makruh (disliked), and this is what is well-known in the madhhab of Imam Ahmad bin Hanbal. And some of them deem it permissible, provided that it doesn't lead to imitating those who have been previously mentioned.