Breaking down some possible factors: 1. Rich people spending their way to better health by purchasing healthcare services 2. Rich people spending their way to

Breaking down some possible factors: 1. Rich people spending their way to better health by purchasing healthcare services 2. Rich people spending their way to better health by purchasing healthy food, gym memberships, and expensive healthy habits 3. Rich people having higher conscientiousness, and this pushing them toward healthier habits regardless of expense. 4. The same genetic makeup that makes you rich also makes you healthy. 5. Being healthy throughout your life allows you to become wealthy more easily, by letting you work harder with less fatigue. My estimation is that your healthy years come before lots of lifestyle interventions (drugs,surgeries, etc)- they are the years that your healthcare consumption is more or less moot. So I think factors 2,3, and 5 dominate here.