There should be a support group for over 30 startup founders that have families, bills, and full-time jobs. My advice to any one trying to do this is to be patient and find a time management system that works for you. Also, get used to the hours between 8pm and 2am. Those hours can be your best friend and worse enemy.
Hi, 38, married, 2 kids, full time job and a mortgage here. My hours are from 4:30am to 7:15am, 30 minutes at lunch and 30 minutes making the next day's todo list before bed. Even though the time I can commit is short I'm much more productive now than I was at 28 working crazy hours.
I don't know where it will lead in the future (maybe nowhere), but I'm prepared to deal with that. The harder thing to deal with is simply sitting on the sidelines doing nothing while life passes me by.