James made it clear that once he decides to retire, he won't unretire like Michael Jordan or Tom Brady did in their late 30s and early 40s.

LeBron James turned 40 years old on Monday, and his birthday's given him a chance to reflect on his nearly 22-year NBA career. When asked if he ever expected to still be competing in the NBA when he was 40, James was honest: He never would've imagined it.

LeBron James turned 40 years old on Monday and continues to defy Father Time on the court with a scoring average of 23.5 points per game on 50% shooting. The previous high-water scoring mark for a player in his 40s: 14.