God can use whoever He wants to accomplish whatever he wants regardless of age or education level. Check out these examples. We’ll start with a classic one that everyone has heard of.
34 When Jesus landed and saw a large crowd, he had compassion on them, because they were like sheep without a shepherd. So he began teaching them many things.
35 By this time it was late in the day, so his disciples came to him. “This is a remote place,” they said, “and it’s already very late. 36 Send the people away so that they can go to the surrounding countryside and villages and buy themselves something to eat.”
37 But he answered, “You give them something to eat.”
They said to him, “That would take more than half a year’s wages[e]! Are we to go and spend that much on bread and give it to them to eat?”
38 “How many loaves do you have?” he asked. “Go and see.”
When they found out, they said, “Five—and two fish.”
39 Then Jesus directed them to have all the people sit down in groups on the green grass. 40 So they sat down in groups of hundreds and fifties. 41 Taking the five loaves and the two fish and looking up to heaven, he gave thanks and broke the loaves. Then he gave them to his disciples to distribute to the people. He also divided the two fish among them all. 42 They all ate and were satisfied, 43 and the disciples picked up twelve basketfuls of broken pieces of bread and fish. 44 The number of the men who had eaten was five thousand.
Jeremiah was just a teenager when God told him he would be a prophet. He wasn’t very happy about it, but he did it anyway, and God was able to accomplish much through him.
4 The word of the Lord came to me, saying,
5 “Before I formed you in the womb I knew[a] you,
before you were born I set you apart;
I appointed you as a prophet to the nations.”
6 “Alas, Sovereign Lord,” I said, “I do not know how to speak; I am too young.”
7 But the Lord said to me, “Do not say, ‘I am too young.’ You must go to everyone I send you to and say whatever I command you. 8 Do not be afraid of them, for I am with you and will rescue you,” declares the Lord.
Timothy was young, yet he was of great help to the apostle Paul in his missionary journeys.
12 Don’t let anyone look down on you because you are young, but set an example for the believers in speech, in conduct, in love, in faith and in purity.
1 Timothy 4:12
No matter what age you are, God can use you. As long as you make yourself available to Him.