Have The Rich Always Been Healthier Than The Poor?

Nope (pdf):

For the ducal families up to 1750, life expectancy was no higher than, and sometimes lower than, the life expectancy of the general population. …Why is this important? The absence of a gradient before 1750 shows that there is no general health benefit from status in and of itself, and that power and money are useless against the force of mortality without weapons to fight.

(Hat tip: Bill Gardner.)