How do I let this older guy know I’m interested in going out with him?

There’s a regular customer where I waitress. He’s a lot older than me and we talk all the time. I know he’s interested because he always asks for my section and wants to know what days I work and I’ve caught him checking me out. He’s nice and he’s mature and not at all like the usual guys I date. But I’m afraid he might not ask me because of our age difference. He’s in his late 50’s and widowed and I’m in my early 20’s.

we have great chats, and I’ve tried to be obvious and flirt with him. My skirts get shorter, my tops get lower cut and he tips more. But that’s it. How can I send a more clear that I like him without seeming like a total slut?
How do I let this older guy know I’m interested in going out with him?
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