'Young' in the Bible

Then they drove him out of the city and began stoning him; and the witnesses placed their outer robes at the feet of a young man named Saul.

and there was a young man named Eutychus (“Lucky”) sitting on the window sill. He was sinking into a deep sleep, and as Paul kept on talking longer and longer, he was completely overcome by sleep and fell down from the third story; and he was picked up dead.

Then Paul, calling in one of the centurions, said, “Take this young man to the commander, for he has something to tell him.”

So he took him and led him to the commander and said, “Paul the prisoner called for me and asked me to bring this young man to you, because he has something to tell you.”

so that they may encourage the young women to tenderly love their husbands and their children,

I am writing to you, fathers [those believers who are spiritually mature], because you know Him who has existed from the beginning. I am writing to you, young men [those believers who are growing in spiritual maturity], because you have been victorious and have overcome the evil one. I have written to you, children [those who are new believers, those spiritually immature], because you have come to know the Father.

I have written to you, fathers, because you know Him who has existed from the beginning. I have written to you, young men, because you are strong and vigorous, and the word of God remains [always] in you, and you have been victorious over the evil one [by accepting Jesus as Savior].