I honestly believe that age 27 is a very monumental turning point for a single woman. When they turn 27, they're faced with the reality that age 30 is approaching. For a woman who's married with at least one child, this isn't really an issue. For a woman who has at least one child, it may or may not be an issue depending on how much she "needs" more children.
A single, childless woman who turns 27 gets a slight wake-up call that age 30 is coming, and there is a looming threat of menopause and potential birth defects with any children she may have. Every birthday until age 30 is a slap in the face that she needs to get her 5hit together and find a man to have a baby.
Finding a man to father her a child isn't the only issue. At age 27, her body begins to start showing signs of ageing. She starts getting small wrinkles, maybe a couple of gray hairs, her tits start to stretch out, her ass starts to lose its firmness, and stretch marks start becoming more prominent. If she's overweight, gravity starts to tug a little harder on those droopy rolls.
Age 27 is also a more difficult age to find a "good man". The men who are willing to marry usually do so between ages 25-35, and a man worth his salt will choose a woman who's under 27. Any men who have been previously married will likely have children, and many will be paying child support to some other bytch they knocked up. The other men who choose not to enter a LTR are likely going to remain single for much longer, perhaps even for the rest of their lives.
The men who are left are the socially awkward ones who have a difficult time getting a date, men who are divorced, men who are parents, and older men who have no desire to become a father again because their children have grown up and moved out.
These are all the reasons why I refer to age 27 as the "age of expiry". It is truly the age where a woman's shelf life had ended, and she gets placed in the discount bin. She's too old to attract a "good man", and she's too young to give up on parenthood. Many women in this age group make it their new mission to be "strong and independent" and find a sperm donor so they can become a single mom, or they find Mr. Good Enough to marry, and then take his money and children when he's no longer useful as a sperm donor.