Mike Tyson will be 58 years old on the night of the fight, July 20. A neuroscientist and a doctor agree: it’s not a good idea for Tyson to be risking his health at that age against a far younger opponent. Structurally, the brain shrinks in size as a person ages, meaning there is more room for it to move around in the cranium. The blood vessels in and around the brain also shrink with age, becoming more brittle and