My cousin got pregnant just out of high school. Her family is not supportive and the dad was still in high school (very immature, he's a good dad they just are not a good couple). She was able to nurse to 22 months. Her daughter weaned when her milk changed when she got pregnant with #2. (She was married at this time). When she delivered her ds, her husband was in Afghanistan, and "attended" the birth via Skype. #2 nursed until she got pregnant again (20 mo). She had 3 miscarriages before conceiving #3 and is still nursing #3 at 18 months.
It's so common to hear of people in her shoes giving up or not trying on the first place. (young, little support, initially a single working mother with no child support, etc) and still be able to nurse beyond a year. She's my role model (even though she's 3 years younger than me!) and I really hope she's able to pass on her success by sharing her story to those who are struggling in the beginning!