US tech entrepreneur and anti-ageing influencer Bryan Johnson , known for spending millions each year to reverse his biological age, has claimed that at 48, many of his vital health markers resemble that of an 18-year-old. Johnson, who runs the longevity start-up Blueprint, credited strict sleep habits, nutrition, exercise and the elimination of “bad habits” for what he calls the “80/20” of his regimen. Also Read | Bryan Johnson’s wellness post draws mixed reactions. See post

He listed several metrics he says fall in the top percentile ranges for men and even teenagers, including:

Muscle: 98th percentile

Body fat: 98th percentile optimal

Bone mineral density: 99th percentile across all ages

Resting heart rate: equivalent to an elite athlete

Fertility and sexual function: top 9

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