A watch nerd and late adopter to wearables, the Birdman will drop in to his 11th X Games next month with a “piece of NASA” on his wrist. For a 54-year-old extreme sports star, time is of the essence. There must be enough time left within the biological aging process for a mass of mitochondria to push the body to terrifying extremes, twisting and twirling high above ground, dazzling onlookers with the total banishment of fear in motion.