The idea of living longer—and healthier—has fascinated humans for centuries. In modern times, this pursuit has taken two very different paths. On one side are tech billionaires like Bryan Johnson, who reportedly spends over $2 million every year  on cutting-edge anti-aging treatments, ranging from experimental drugs to cryogenic therapies. On the other side are individuals like Julie Gibson Clark , who takes a much simpler approach: exercise, meditation, plant-forward eating,