The follow up questions are, what are the real risks?
Some people seem to be making an assumption that there is more risk as you get older. Risk isn't so cut and dry. Certainly you may have more risk as it pertains to your family. By the time I was 35 I was married with kids and a mortgage. Certainly there is more risk of changing your retirement. By the time I was 35 I had more money going towards retirement as well as retirement funds collected. By starting a business I was significantly risking those things.
Some people also make the assumption that young founders make better founders. By the time I was 35 I had worked for many companies and corporations, large and small. I had learned quite a number of business rules for myself and I had come up with a set of rules and patterns that worked in business. At 25 I did not have those experiences or that knowledge at all. I thought I did, of course, but I did not.
Over all I felt it was much less risky at 35+ to start a business and leave the day to day. But that was for me. I also found no problem at all jumping back into a day job if a business didn't work out. So it hardly seems like a risk at all.