3 reasons why Cristiano Ronaldo can keep his promise of playing until the age of 40

#2 Constant evolution

Cristiano Ronaldo during his early years at Manchester

Cristiano Ronaldo's nature to constantly adapt and evolve with different systems in modern football is a huge reason for his consistency over the years.

When Cristiano was a teenager, he wanted to dribble past defenders and beat them with trickery. But under the tutelage of Sir Alex Ferguson at United, he made himself more efficient and productive in the left wing.

Despite his dribbling being high during his initial seasons with Real Madrid, he was more of a machine. To settle into Jose Mourinho's defensive style, he became a tremendous goalscorer while leading the team's counter attacks through the left.

Later under Carlo Ancelotti and Zinedine Zidane, Ronaldo prospered at being a free forward with Los Blancos. He could roam into spaces, pick the passes and score which helped him remain a world class player even after he reached 30 years old.

After turning 30, it is crystal clear that he is more of a gunslinger than the driver. His dribbles and touches became lesser while his shots at goal increased. His own constant evolution on the pitch might keep him at the very top till 40.