Why is this guy at work not taking no for an answer?

There's a guy at work whose leaving on Friday.

He's 23 & I'm 38. Big age difference. I just chat to him mainly cause he's next to me.

I went overseas last month & before I went he asked me out for lunch but I said no.

On Monday he said to me "Do you want to have a drink just us, it will be the last time we see eachother."

I said no & he left it for the day.

Today he asked again for a coffee just us again.

I said no but will come to the teams farewell and then he goes "so you don't want to do anything just us?"

I said "I'll just talk to you here at the desk."

He keeps asking and I've already told him no.

It's a huge age difference and I don't know what to do if he asks again?

It's making me uncomfortable and one woman who sits on the otherside of me who heard asked if I was ok.

I don't want to be firm but he just doesn't get it.

Why is this guy at work not taking no for an answer?
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