The most powerful biohacks might be free , but that hasn’t stopped health-conscious high rollers from shelling out serious cash in their quest to live longer and feel younger. Among them is biohacker Gary Brecka , a human biologist, longevity expert and wellness guru to the stars who says that when the wealthy invest in high-priced gadgets, personalized medicine or next-generation treatments, they all share the same goal. “High-net-worth individuals want one thing: Time back — physically and