LeBron James thought he could become "one of the greatest players" in NBA history as a teenager after the Los Angeles Lakers man enjoyed a birthday game to remember.

The superstar forward celebrated his 38th birthday in style with a mammoth 47-point performance to steer his side to a 130-121 comeback win against the Atlanta Hawks on Friday.

In his 20th season now, James continues to build upon a legacy that already includes four championships, four MVP awards, and two Olympic gold medals, among other accolades.

Reflecting on his time in the NBA, he put himself into the shoes of his younger self and spoke of the ambition he had two decades ago to prove he could thrive in the sport.

"I feel better than [I felt at] 18," James said. "I didn't know what I could become at 18.

"But I just knew if I continued to put in the work, I continued to be true to the game, then I could be one of the greatest players to ever play this game.

"I just always believed that. There are times when I'm on the floor where I do feel like a kid again. That's for sure."

James' dominant performance, which also included 10 rebounds and nine assists at State Farm Arena, continued to showcase his age-defying skills on the court.

He is the third-oldest active player in the NBA right now, behind Udonis Haslem and Andre Iguodala, and he sees no reason why he cannot play on further.

"[I have got to] make sure my mind stays fresh, and my body, more importantly," he added. "As long as I keep my mind fresh, my body will follow."