I don't want to speak for YC or their intentions, so perhaps target is the wrong word here, since I doubt they have model that looks to offer to the needs of a particular subset of people and then "sell" to them. That would be the traditional definition of a "target market"
However, what YC presents is a series of preferences and options that everyone knows appeal much more to a certain personality and - in this case - stage of life, than others. Jumping across a country to live in temporary stasis for three months (or whatever) isn't something a 45 year old woman with two kids and a career is likely to do. It's something a lot of 20 something college kids will consider though. Are they targeting college kids with that stance? Not particularly. Does their offering appeal to one demographic much more than another? Most certainly.
Overall though it's irrelevant, as I said. YC can target or not target as they choose.
The bigger point is that it's pretty hard for that 45 year old woman to gain traction in the tech world right now, and there could be an opportunity cost there that may be pretty large, considering how the demographics of entrepreneurs spread out over other industries.
However, what YC presents is a series of preferences and options that everyone knows appeal much more to a certain personality and - in this case - stage of life, than others. Jumping across a country to live in temporary stasis for three months (or whatever) isn't something a 45 year old woman with two kids and a career is likely to do. It's something a lot of 20 something college kids will consider though. Are they targeting college kids with that stance? Not particularly. Does their offering appeal to one demographic much more than another? Most certainly.
Overall though it's irrelevant, as I said. YC can target or not target as they choose.
The bigger point is that it's pretty hard for that 45 year old woman to gain traction in the tech world right now, and there could be an opportunity cost there that may be pretty large, considering how the demographics of entrepreneurs spread out over other industries.