'Older' in the Bible

The three older sons of Jesse had gone after Saul to the battle. And the names of his three sons who went to the battle were Eliab the firstborn, and the second to him Abinadab, and the third Shammah.

Then Saul said to David, “Here is my older daughter Merab; I will give her to you as a wife, only be a valiant man for me and fight the Lord’s battles.” For Saul thought, “My hand shall not be against him, but let the hand of the Philistines be against him.”