Bryan Johnson. Magdalena Wosinska46-year-old tech entrepreneur Bryan Johnson is known for his anti-aging program.He's offering the basics of his program to 2,500 participants for around $333 a month.More ambitious participants can also invest up to $1600 into measuring biomarkers. Bryan Johnson — the 46-year-old tech entrepreneur who founded the payments processing company Braintree — may be best known these days for his rigorous anti-aging program. As part