You might find these accounts interesting with regard to the age difference between Jonathan and David. Notice the reference in Acts 13:21—”And afterward they desired a king: and God gave unto them Saul the son of Cis, a man of the tribe of Benjamin, by the space of forty years.”
Jonathan was a grown man when his father (Saul) came to the throne.
1 Sam. 13:1-3—Saul reigned one year; and when he had reigned two years over Israel, Saul chose him three thousand men of Israel; whereof two thousand were with Saul in Michmash and in mount Bethel, and a thousand were with Jonathan in Gibeah of Benjamin: and the rest of the people he sent every man to his tent. And Jonathan smote the garrison of the Philistines that was in Geba, and the Philistines heard of it. And Saul blew the trumpet throughout all the land, saying, Let the Hebrews hear.
1 Sam. 18:1-7—And it came to pass, when he had made an end of speaking unto Saul, that the soul of Jonathan was knit with the soul of David, and Jonathan loved him as his own soul.
2 And Saul took him that day, and would let him go no more home to his father’s house.
3 Then Jonathan and David made a covenant, because he loved him as his own soul.
4 And Jonathan stripped himself of the robe that was upon him, and gave it to David, and his garments, even to his sword, and to his bow, and to his girdle.
5 And David went out whithersoever Saul sent him, and behaved himself wisely: and Saul set him over the men of war, and he was accepted in the sight of all the people, and also in the sight of Saul’s servants.
6 And it came to pass as they came, when David was returned from the slaughter of the Philistine, that the women came out of all cities of Israel, singing and dancing, to meet king Saul, with tabrets, with joy, and with instruments of musick.
7 And the women answered one another as they played, and said, Saul hath slain his thousands, and David his ten thousands.
1 Sam. 19:2-7
2 But Jonathan Saul’s son delighted much in David: and Jonathan told David, saying, Saul my father seeketh to kill thee: now therefore, I pray thee, take heed to thyself until the morning, and abide in a secret place, and hide thyself:
3 And I will go out and stand beside my father in the field where thou art, and I will commune with my father of thee; and what I see, that I will tell thee.
4 And Jonathan spake good of David unto Saul his father, and said unto him, Let not the king sin against his servant, against David; because he hath not sinned against thee, and because his works have been to thee-ward very good:
5 For he did put his life in his hand, and slew the Philistine, and the Lord wrought a great salvation for all Israel: thou sawest it, and didst rejoice: wherefore then wilt thou sin against innocent blood, to slay David without a cause?
6 And Saul hearkened unto the voice of Jonathan : and Saul sware, As the Lord liveth, he shall not be slain.
7 And Jonathan called David, and Jonathan shewed him all those things. And Jonathan brought David to Saul, and he was in his presence, as in times past.
Notice how old David was when he came to the throne after Saul’s death. He ruled first in Hebron (Judah) and then in Jerusalem (all Israel).
2 Sam. 5:2-5
2 Also in time past, when Saul was king over us, thou wast he that leddest out and broughtest in Israel: and the Lord said to thee, Thou shalt feed my people Israel, and thou shalt be a captain over Israel.
3 So all the elders of Israel came to the king to Hebron; and king David made a league with them in Hebron before the Lord: and they anointed David king over Israel.
4 David was thirty years old when he began to reign, and he reigned forty years.
5 In Hebron he reigned over Judah seven years and six months: and in Jerusalem he reigned thirty and three years over all Israel and Judah.
There is never even the slightest hint that Jonathan was envious of David in anything. Jonathan had everything to lose from David’s replacing his father on the throne, but he seems to have understood and accepted from the beginning that David was God’s chosen.
STAY WELL, DO GOOD AND SEEK WISDOM. ALSO REMEMBER: 1 John 2:4-6
Beth Johnson