I went to a private longevity night hosted by Bryan Johnson in San Francisco. I needed a cookie afterward.

Bryan Johnson cheers on participants as they try to do as many push-ups as possible during a longevity test. Ben Bergman/Business Insider 3,000 people signed up for a "private evening" with biohacker Bryan Johnson. There were only 100 slots. The evening featured breathwork, bioage tests, turmeric juice, and food "guided" by Johnson's chef. I was struck by how many questions came down to people wanting to essentially hack life. The only topic these days that gets people in San Francisco to stop talking about AI is living forever. When Baseten, an AI startup (what else?), announced a few weeks ago, it was hosting a "private evening" with tech entrepreneur and longevity evangelist Bryan Johnson and VC Sarah Guo at its SF office, over 3,000 people applied to get in for just 100 slots. For the uninitiated, Johnson made hundreds of millions selling his payment startup to PayPal and now spends millions a year on a wellness regime that he shares with his 2.7 million Instagram followers. Johnson has been in the news a lot this summer, after he revealed he has autoimmune gastritis, an incurable chronic condition of the stomach. Then, last month, he said, "he might have taken 'this whole long