Fuck, kid. You have no idea what the bar and restaurant business is all about or how it works.
This is what you do. You come up with an idea that will attract a repeat clientele. If you want to be bold and raise the risk of failure—which is already an 80% chance that you will fail in the first five years without ever seeing a profit—you target a specific clientele. If you’re right, they vote on your idea with their dollars. If you’re wrong, you go broke.
If you’re smart, you will gear your place to serve different clientele at different times of the day, so you’re always making money. So your employees are not on the clock picking at their fingernails. The slow time between lunch and dinner is a money loser, therefore you have early bird specials for people who eat early and go to bed early. Then comes the younger crowd.
Women don’t spend money in bars like men do. And men don’t hang around much if there are no women and women won’t hang around a place where there are only guys. They don’t feel comfortable. It’s a fact that every bar owner knows. So, you institute ladies specials and ladies nights. Women come in and attract more guys. Guys spend money like it’s going out of style when there are women in the house. All you have to do is keep the ladies room clean. That is incredibly important. A younger clientele might spend more money on the weekends, so you institute a weekend Student discount (ever hear of that, fuckbean?) and don’t be too strict about the college IDs. If you do it right, you keep a full house and make money.
It’s pretty obvious you don’t like “old people.” It’s also pretty obvious you are an asshole. There are plenty places that will serve you. Bars are full of assholes. Many of these bars have no old people in them. But I think the next time you’re in a bar that has old people in it, you should find and old asshole and try to have a conversation with your future self. It might be enlightening, and a little scary.