Interesting ideas and a very good introduction to the idea of health span over life span. The author talks about a number of ways to increase your overall life, while also making those extra years better. You can do this by prioritizing health and wellness to avoid diseases and natural processes that ravage the aged. Many, if not most of these tools however, are only accessable to the ultra-wealthy. A point the author himself makes.
It is useful, however, to anyone who wants to make the best decisions you can make for free such as prioritizing a healthy diet, exercising, and sleeping better as well as things that cost some money like regular doctor's check-ups and cancer screenings. So even those of us in much lower tax brackets may be able to gain at least a few extra healthy years.