What Genesis says about the marriages

Jacob loved Rachel and agreed to serve Laban seven years for her. At the end of the seven years Laban gave him Leah first, then gave him Rachel as well, and Jacob served another seven years. Genesis presents the two marriages close together after the first seven years of service.

The text does not print Jacob’s age on the wedding day. The age is reconstructed from later fixed points, especially Joseph’s birth and Jacob’s age in Egypt.

Why about 84 is the standard estimate

Joseph was born at the end of the fourteen years of service for the two wives, when Jacob was about 91. Counting back seven years from Joseph’s birth places the marriages at about 84; counting back fourteen years places Jacob’s arrival in Haran at about 77.

Leah and Rachel were therefore married when Jacob was about eighty-four on this chronology. Exact month-level precision is not claimed; the figure is the best fit to the clear ages later in Genesis.

Leah first, then Rachel

Although Jacob had served for Rachel, Laban gave Leah on the wedding night. When Jacob protested, Laban appealed to local custom and then gave Rachel also, with the requirement of another seven years of service. Jacob loved Rachel more than Leah, and the following chapters record the births of their children and the children of the handmaids.

Questions that ask specifically about Leah or Rachel usually share this same age estimate, because Genesis places both marriages at that point in the seven-year cycle.