A handy guide for all business owners who are just itching to put the "Since (Year of establishment)" tag on their signs, here is a chart of minimum ages required for different business before such a claim can be laid:

Bank - 100 years
Insurance Provider - 80 years
Grocery Store - 30 years
Restaurant - 20 years
Auto Body Shop - 15 years
Video Game Developer - 10 years
ISP - 5 years
Web Design Firm - 2 years

Hope that helps.