It's odd that there are so many female "leftovers". With the skewed gender balance due to the one child policy, I'd expect mostly male "leftovers". Though I guess they don't carry as much of a stigma as women do.
Which means, there's talented, very smart women in China who are struggling to find suitable husbands, because they are equal to high status men. And those men are looking for women with less status.
The Male leftovers tend to then be at the bottom of the status chain, because there's no lower status of women to marry. So there are loads of rural areas and villages where women have moved to the city, and men remaining have no viable marriage prospects. (This is the segment negatively affected by one-child policy)