A middle-aged man in a green jacket is talking to another middle-aged man in a light blue tee-shirt.
Older man with green jacket conversing with another man.
Middle-aged man is older man, and talking is conversing.
A middle-aged man could also be described as an Older man, also conversing is a synonym for talking to.
A middle-aged man is an older man. He is talking to another man, which would show that he is carrying on a conversation or conversing with another man.