I can relate. I am 33 and married, no kids. The only difference for me before and after (getting married) is the amount of time you have available for your startup before you need to spend time with your wife or kids. Age is not a factor, the amount of time you have is the factor. But having someone supportive, wife or gf, is really a big plus. And it really helps a lot when you use them as a listener to pitch your idea to. They come up with amazing questions.