On the age of eligibility to be a ben sorer u-moreh the Gemara stipulates 3 months only, at the age of 13. But the mishnah stipulated physical signs of majority. So the Gemara minimizes the time to say that whichever comes first – the second physical sign of majority OR the end of 3 months. Also, a fairly difficult amud about how young one may have fathered children – in this case, the lineage of David and Solomon, with a lot of math and some extreme conclusions.
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