And Lebron has by FAR the most mileage of any player in his 15th year too.
Kobe had 35,134 regular season minutes and 7,811 playoff minutes going into his 15th year. Not to mention his responsibilities being relatively more limited due to playing in the triangle and 7 years of Shaq as the #1.
Malone had 41,661 regular season minutes and 6,170 playoff minutes going into his 15th year. Not to mention having Stockton to take care of the ball-handling and distribution responsibilities that whole time.
Lebron had 41,272 regular season minutes and 9,127 playoff minutes going into this year. (And you know those playoff minutes count double.) He's been his team's leading scorer AND his team's leading distributor AND one of the most important rebounders and defenders on the team for that ENTIRE run. Plus 4 international team runs during that time too.
No one has ever played this much basketball with this much responsibility at this age. And he STILL getting better.