Okay, using real data:
I’m a straight male (and obviously geeky enough to do this!)
I’d prefer to only consider people living in my area, since I’m not a big fan of long-distance relationships.
I live in the DC metro area. According to the 2000 census, there were 4,923,153 in this area. Of those, 2,525,807 (51.3%) are female. I’d prefer to date someone relatively close to my age, say 25-34. Looking at the census data here , there are 403,407 women (8.2% of total population) that fit the bill.
Unlike some people, I don’t consider married people to be “dateable”. No time to track down the age distribution by maritial status, but I’ll say that 50% of women are married (thus 50% never married, widowed, or divorced) in my acceptable age range. That may actually be a bit high for this area. This drops the number to about 200,000 or 4%.
And then there are all those other factors to consider that I don’t know how to quantitate. I’d say 1 in 4 that made it this far would be “dateable” (e.g. worth seeing how thing go on a first date) in my estimation, which is ~1% or ~20,000 women.