Or limited by how many people you could date in that age range who would likely still be interested in you until you reached a certain age. I have no data on this, but I'm willing to guess that most 23-year-old girls won't want to be dating an 80-year-old man.
Wow, this is pretty poor analysis. You're casting your net far too wide, and also if you're basing your numbers on Tinder swiping, you're making the big mistake of thinking that the women in your local area are similar to the women worldwide. Sign up for Tinder Plus and start swiping in someplace different; if you're in some nice metro area in the US, try some place on the opposite side of the country, in a rural area, and see what you think of the women there. Hint: I swipe left for women who have pictures of themselves with rifles and dead deer. Those women will be more common in some locales than in others. (Same goes if you're into such women: you're not going to find many women like that in the NYC area.) Better yet, set your location to someplace like Mumbai or something. See if there's anyone there you have anything in common with.
Face it, you're probably going to only be interested in certain types of women, who come from certain cultures. I'm going to guess, for instance, that a conservative Islamic woman from Saudi Arabia is not going to be of interest to you, nor would a village-dwelling subSaharan African woman who lives in a mud hut.
Finally, most people want to date someone who lives reasonably close to them so they can meet them in person and get to know them. That limits you more than anything.
So, instead of ~700M women in your age range, that should cut it down by a few orders of magnitude.
And speaking of Tinder, you missed the other part: the women have to be interested in dating you. How many of those women on Tinder have "liked" you? Probably not that many. And out of those, how many have actually responded when you messaged them? Probably only a fraction, based on my own Tinder swiping. (A lot of people there don't seem to be serious about meeting and dating.)
When you consider all the real-world factors that people use to gauge a mate's viability and set a minimum standard, the pool of dateable people becomes much, much, much smaller.
