The one that is birthed first; in other words, the one that comes out of the mother first.
No, the elder one is the one born first, just like with all children.
The first one delivered.
They are rarely, if ever, delivered at the same time. So the one who is delivered first is the elder.
The first to come out.
Twins are not acceptable in the community in "The Giver" because they disrupt the balance and sameness that the society seeks to maintain. One twin is released, which means they are euthanized. The Chief Elder makes the decision about which twin should be released based on arbitrary reasons like weight and which one was born slightly earlier.
Hinemoa Elder was born in 1966.
Melania the Elder was born in 325.
Jennifer Elder was born in 1968.
Grimoald the Elder was born in 616.
Dave Elder was born in 1865.
Elder Olson was born in 1909.
Elder Herrera was born in 1968.