If you don't have any major expenses, and can afford to live w/out a salary (as my experience at a prop firm), your not too old at all. The reason most of the guys at prop firms are young is b/c they are the only ones who can afford not getting paid for 6-12 months. The only older guys who have worked out at my firm are ones who were already independently wealthy.
Thanks. Right now, I have a day job as well as an evening job. I've saved up around 8 months of living expenses from the former. I'll keep the evening job if Swift Trade accepts me.