God uses people of every age, none are too young or too old. We think of Abram, as he was then known. At the age of 75, he was a nomad wandering the desert with his wife Sarai, as she was also then known and his nephew Lot. They had much cattle and servants. The couple had heart-break because they were not able to have children but God asked Abram to set out on a long journey to the country of Canaan. Abram was obedient.
Many years later a young man who as a baby had been rescued from a basket in the bulrushes received a call from God to lead his people out of slavery from the Egyptians. In spite of his reservations and with the help of God and his brother Aaron, he obeyed.
Samuel was a young lad, not yet knowing the ways of the Lord but when God called him, after guidance from Eli, he obeyed.
Caleb was 80 when he asked God for a new divine assignment. He didn’t think he was too old. After guidance from God he was obedient.
Zachariah, the father of John the Baptist and his wife Elizabeth were old and unable to have children. Yet when God spoke to him and foretold that he would have a son, he obeyed God’s instructions though at first he argued with Him
Paul needed to instruct the young Timothy that he wasn’t too young to serve God and should ignore anyone who held his youth against him.
It is obvious that God doesn’t consider age in His callings and neither should we. When God calls, He equips. We are never too old or too young.