Tech entrepreneur Bryan Johnson is 45 years old but he wants the body of his 18-year-old self. He wants to reverse the aging process in his brain, heart, lungs, liver, kidneys, teeth, skin and more. Johnson built a medical suite in his California home with a team of 30 doctors and health experts. He works out for an hour every single day which consists of 25 different exercises. Also to keep track of his health, Johnson undergoes numerous blood tests.