It's like the produce section has been picked over:
"The pool of people available for an LTR becomes more and more dominated by those who are not good prospects for an LTR. Once you get into your fifties there might be an influx of “fresh blood” in the forms of women and men who’s first partner died young, but it does little to better the outcomes in aggregate. This is why you often see older men marrying younger women, because the pool of women age 20 – 30% has not yet been hit with the full force of self-selection. It is for this same reason that some of the older gents I talk to often complain of slim-pickings in their own age group."