Rollo Tomasi says this phrase when referring to male value in dating. He says that for most men, they often have to build up competency in their craft, grow their financial wealth, build up status and confidence to be deemed of value to women. While a woman just being born is given inherent value by society which passes over into dating. He says that for most men their max potential where they have the right balance of status, money and youthful looks is around 35-37 years of age.
We see evidence of how important status and money is to a man's value when we look at Leo constantly having beautiful early 20 year old girls throwing themselves at him despite knowing his rep for discarding them when they hit 25.
Funny enough, a lot of men never get to capitalize on this power since they often get snatched up by women around 29 to 31 years of age. This is right around the time that women's values are going down in dating/sexual market place due to loss of youthful look and fertility.