Children, before they use screens and develop niche interests, are the only mass market left. Children are also the only normal people left, in the sense that six year olds are similar to six year olds from 50 years ago, in a way that 13 year olds are not.

my theory on bryan johnson is that while he's spending millions trying to live forever, his most effective 'longevity hack' is having a mission he wakes up excited about.