How can I show an older man I’m interested in him?

Anonymous
I’m 28 and have developed feelings for a 51 year old. I’ve never had feelings for someone older than me and I tried to brush it off months ago but I can’t. I’ve only dated people around my own age before so I feel like it’s a bit different and don’t know how to make it obvious to him that I actually like him without telling him and making a complete fool myself. We work for the same company but based in different branches so I don’t work directly with him.

He is quite flirty but I don’t know if he’s just being nice as he is quite charming. He messages me now and again but it’s always just short friendly chats. Or if I see him in person he always mentions my photos and gives me compliments on my looks etc. He is single too. Please help...
How can I show an older man I’m interested in him?
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