Bava Batra 120: A Miracle for Yocheved
Starting with some aggadah - a miracle that was done for the daughters of Tzlofchad that parallels the miracle done for Yocheved: bearing children "older," but really older. And the Gemara does the math for us -- and explains the miracle of her returned youth in detail. Also, shifting focus back to the daughters of Tzlofchad and the order of their names in the Torah -- once for their age order and once for their measures of wisdom. Plus, the exhortation that they marry people who are suitable for them.