It's highly likely that you would need a permit to do this. You would taking up space on a public sidewalk, public road, or public easement for the purposes of making money. Check with your local government to see what their regulations are. Chances are they require you to get a permit in order to do this. If your location is not in an area where permitted activities such as this are permitted, you will not be legally able to do this. If you do it anyway, then you are subject to ticketing for violating local ordinances.
What is the corner like? There are some corners where it might be safe, but many others where a 73yo on a street corner would simply be an invitation for crime -- especially since you would probably need to have money on hand to make change for customers.
Edit: It would be *much* safer and less likely to be illegal if you would find local boutiques or craft fairs where you can display your handmade items for sale.