I don't know of any specific demographics nationwide. It seems to be limited by need in a particular area and by training. Before a shopper can perform shops for them, the shopper has to take a 2-3 hour on-site training that the company puts on in one of the restaurants in the area. If no training is scheduled, a shopper can't start shopping for Ardent.
Training is only scheduled when Ardent needs new shoppers in an area. Since it's a great company, most shoppers continue to shop for them. They don't just bring new shoppers on unless they need them. Their long-term shoppers get automatic assignments every month. This is not a company that wants a huge overload of shoppers. As long as the long-time shoppers are effectively handling the shops in an area, they do not train new shoppers, preferring to continue to work with and to reward their current shoppers. I respect that. It is hard to get in, but, once you are in, this company values and respects its shoppers.
What area are you in? How many of the restaurants are there in your location? With the problems the company has recently been through, Ardent has told shoppers that the client is cutting down on the number of monthly shops being performed, so it is probably getting more difficult to get in. However, if you are in an area where the company is opening new locations, there will probably be training coming up. If there is not a lot of growth in your area, you may not get an opportunity until a current shopper dies or quits.