[gmays]

Certainly not. In fact during the Female Founders Conference today Jessica mentioned that there's someone in the current batch who's in their late 60's.

Assuming you don't squander your early years starting older has some advantages. When you're older you've likely built some domain expertise, have a better idea of what you want from life, and can support yourself better.

For example, I started in my late 20's. By that time I'd saved a lot of money, built steady passive income, was married (wife's career keeps her busy), and didn't have any kids. Since most other areas of my life were taken care (especially financial) of I could pour myself into my startup without worrying about raising money or runway.

That said, remember that wanting to feel "the excitement of a start-up" is the wrong reason to join or start one. Before quitting your job I'd highly recommend just starting a side project and do it for at least 6 months before making any major decisions. It's very unglamorous and odds are you won't even launch a product, which is fine. Better to learn that now than after you quit your job because 35 isn't too old to start a startup but it is too old to be unemployed.