What would be the most common way to say guy and girl/lady in French? (Assuming you are talking about someone in their 30s or 40s and want to be polite but not too formal).
Today I was speaking in French about the guy who I do a skype French language exchange with.
In English I would refer to him as "the guy who I do a French language exchange with" however I didn't know what to say in French. Is homme too formal? I could refer to him as my friend but this wouldn't work for situations where I don't know the person well. I wasn't sure whether other words were just used for very young people.