G-d is not finished!

[1 Kgs. 18:19] So he departed thence, and found Elisha the son of Shaphat, who was plowing with twelve yoke of oxen before him, and he with the twelfth: and Elijah passed by him, and cast his mantle upon him.
Elijah seeks out a group of men who are plowing, walks silently past eleven of them, and upon the twelfth, Elisha, casts his mantle. By this act, Elijah both tests Elisha’s readiness to serve and allows him to respond in freedom. The mantle, made of hair (2 Kgs. 1:8; Zech. 13:4; Matt. 3:4), was the symbol of the prophetic office (2 Kgs. 2:8, 13-14). By that ceremony conferring upon him the office of a prophet, which G-d was pleased to accompany with the gifts and graces of His spirit. This was an installation with the prophetic office. It is in this way that the Brahmins, the Persian Sufis, and other priestly or sacred characters in the East are appointed - a mantle being, by some well-known priest, thrown across their shoulders. Elisha had probably been educated in the schools of the prophets.
Elisha knew what the sign meant. He was a wealthy man. The call was to follow Elijah as a servant, pour water on his hands, perhaps to die with him. There was no time to think, the decision had to be made in a moment. The call of G-d in his heart was at once responded to. Obtaining leave to say farewell to his parents, he kills the oxen, smashes up the implements, and shows to all his companions that he had no more to do with his former life. G-d is calling each one of us; let us follow at whatever the cost. Do not allow any earthly affection to detain you from obeying His call. G-d's spirit, which both changed your heart, and consecrated you to your prophetical office: which therefore it concerns you vigorously to execute, and wholly to devote yourself to it.
Having thus satisfied the fiery zeal of the erring but sincere and pious prophet, G-d proceeded to correct the mistaken impression under which Elijah had been laboring, of his being the sole believer of the true religion in the land; for G-d, who seeth in secret, and knew all that were His, knew that there were seven thousand persons who had not done homage (literally, "kissed the hand") to Baal.
Elisha begins his career as an apprentice, serving as Elijah’s attendant. This is the only account in the OT of such an entry into the prophetic office, but it may have been customary at the time (Ex. 24:13; 33:11; Num. 11:28; Josh. 1:1). There is no formal ceremony of anointing, nor was it the practice of the OT to anoint prophets. Elijah must have taken the bestowal of his mantle on Elisha and Elisha’s response as the equivalent of anointing.
It is of great advantage to young ministers, to spend some time under the direction of those that are aged and experienced; and not to think much, if occasion be, to minister unto them. Those who would be fit to teach must have time to learn; those should first serve, who may hereafter rule.
Reflections on 19-21: Elisha’s summons to be a prophet was a call to an office of risk. Prophets had been killed, others were in hiding, and Jezebel had run Elijah out of the country. The office was not a popular one. Elisha had to give up his life as a farmer (and if the twelve yoke oxen were his, he was a very wealthy farmer) and follow Elijah. Elisha’s call required humility, to become Elijah’s attendant. Elijah’s summons meant that Elisha had to make a complete break with his old way of life and become totally committed to the new. In spite of all this, Elisha accepted with joy and enthusiasm. He was so honored by Elijah’s summons and so eager to accept that he ran after Elijah. And Elisha celebrated his new calling with a sacrificial meal with the people of Abel-Meholah and demonstrated his commitment by preparing the meal from the very yoke of oxen with which he had been plowing.
Messianic Discipleship is equally if not more demanding and equally if not more a privilege and a joy.
Just when you think are to old to serve G-d, or not doing anymore good, He has you teaching the younger, passing down your experiences and knowledge of Him!
G-d is not finished with you yet!