Dolly Parton grew up poor with a dozen siblings, Loretta Lynn was married at 13 and had 4 kids by the time she was 17.
This is a point that speaks more generally to the difference between country music of a generation (or more) ago and current "country pop" - i.e., the country has changed. Not only are the performers a great deal less likely to come from a rural poor background, but the target audience is suburban middle class.
Taylor Swift, in fact, knows a good deal about life and writes pretty directly about it - what she knows, though, is stuff that most of us have forgotten about by the time we're out of our twenties but seemed pretty damned important at the time...and so it was, and is.