45-year-old tech founder and CEO Bryan Johnson is spending $2 million a year to reverse aging. Longevity experts are both fascinated and highly skeptical—largely due to the fact that genetics and pure luck, which factor heavily into how long you live, are far out of our control. However, this is not stopping Johnson from reversing the aging process. With the help of a 30-person team ranging from nutritionists to MRI specialists, he undergoes daily body fat scans, routine MRIs, and often, invasive blood and stool sample tests to see the biological age of his organs.