World sees rise of 'One' population

More young people are choosing to be single rather than rush into marriage

For Ashely Gray, a 26-year-old web developer living on the Upper West Side of Manhattan, the best time of her day is in the evening after a long and tiring day at work - and when she is alone.

"I will cook my own dinner - I can eat whatever I want, I will go to the gym, then get beers and watch my favorite shows on Netflix," said Gray, who has been single for about 5 years after breaking up with her college boyfriend. "Or I can choose to hang out with my friends."