how old was lebron james when he started his nba career

LeBron James was 18 years old when he started his NBA career. He made his NBA debut on October 29, 2003, shortly after finishing high school.

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Detail	Answer
NBA debut age	18
Debut date	October 29, 2003
First game points	25

He entered the league straight out of high school and immediately made a major impact in his first game.