I'm past arguing that YC isn't worth it because the money is too small and getting funded is a bad trajectory[1]; the program has clearly been a huge win for a lot of people. But you can execute the 37signals playbook after attending YC. Just go, launch, and then consult.
If you have a 3-person team with a strong dev that has a short runway, that dev should have no trouble picking up 1-2 month projects to keep himself going with the company. It is so straightforward to do this, the money is so good, and the commitments are so flexible that I'm led to question the "you should make as little as possible" advice.
Why burn your family out? There's no points for effort, only for execution.
I'm 34, for what it's worth.
[1] I still believe both those things, though.