Most of the places where I've worked in the past offered a 25% discount to local shop owners and employees. The "neighbors" were happy, and it kept the business coming in.
Do people actually ask you how old you are?
I can see how they'd get a little jealous, especially considering your age and the fact that you inherited a business. Most people working in malls are stuck in retail jobs that they probably hate. If the business wasn't run very well before you took over, that reputation is going to stick no matter what you do.
For example: I used to get pizza at a place that made a very good pizza. They sold the business, and the people who took over changed the recipe, and I tried the pizza and it was absolutely terrible. I never bought pizza from that place again. Last year, a new owner took over, and I've heard that the pizza is good again, but I keep on remembering how terrible the bad pizza was, and I can't bring myself to give the new guy a try. Everytime I drive past the place, I immedicately recall the crappy pizza experience.
Maybe people aren't giving you a chance because of a bad reaction to the previous management/employee/quality issues.
Did you change the name of the place, or did you keep the old name?
You have 7 months until your lease is up. Are you considering looking for a different location? If you can hang in there (or break the lease without a huge penalty) it may be your chance to get a fresh start.
Rose