The condition of reaching puberty for the mahram
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Question: What is the minimum age for a young man to be a mahram for a woman if she wants to travel?
Answer: The minimum age at which a man becomes a mahram for a woman is puberty, which is completing fifteen years of age, or the emission of semen with desire, or the growth of coarse hair around the private parts, which is called the pubic hair.
When one of these three signs is present, the male becomes accountable, and it is permissible for him to be a mahram for a woman. Likewise, the presence of one of the three makes the woman accountable, and the woman has a fourth sign, which is menstruation. And success is from Allah.
Answer: The minimum age at which a man becomes a mahram for a woman is puberty, which is completing fifteen years of age, or the emission of semen with desire, or the growth of coarse hair around the private parts, which is called the pubic hair.
When one of these three signs is present, the male becomes accountable, and it is permissible for him to be a mahram for a woman. Likewise, the presence of one of the three makes the woman accountable, and the woman has a fourth sign, which is menstruation. And success is from Allah.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.