From a recent Time Magazine article, Saving Capitalism.
A couple of weeks ago, a poll conducted by the Harvard Institute of Politics found something startling: only 19% of Americans ages 18 to 29 identified themselves as “capitalists.” In the richest and most market-oriented country in the world, only 42% of that group said they “supported capitalism.” The numbers were higher among older people; still, only 26% considered themselves capitalists. A little over half supported the system as a whole.
Source: Time Magazine, May 12, 2016.
The Harvard Institute of Politics poll can be found here.