How can I make it obvious to an older guy that I’m interested in him?

Anonymous
We work for the same company - we don’t work directly with each other though. We are literally in different buildings so I rarely see him.
So I met him at work a few years ago and I get on great with him.
He is sometimes quite flirty but I don’t know if it’s just a bit of banter as he’s very charming and outgoing compared to me.
He is single. He is 50 and I’m 29.
He added me on all my social media and we sometimes message each other.
I’ve never been interested in someone older than me before so I’m kinda confused about my feelings for him as I never expected to feel that way about him - but I really like him and don’t know what to do.
How can I make it obvious to an older guy that I’m interested in him?
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