Quote from Churn4Fun:
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.