How come restaurants don't offer a "Not a Senior" discount?

If I owned a restaurant the first thing I would do is advertise a “Not a Senior” discount to get the young people in. It’s the perfect way to get the young people in and keep the old guys out. The problem bars and restaurants have is they fill up with old people before the rest of us get out of work and then we don’t want to go there. So we end up going to some place old people don’t go and have to pay twice as much. My theory is you keep the old people out by not giving them a discount. Let the places who give senior discounts fill up with old people and the places that actually want to make money offer a “Not a Senior” discount. Makes sense to me