When he was 28 yrs old, she was just born. He could even be older than her parents man! Just like one of my friend who is 48 this yr, who is having an affair with his friend's daughter who is 24yrs old. He felt very awkward whenever he sees her dad his friend. The girl has a steady bf and her relationship with my friend is purely a fark relationship as she finds him awesome in bed, something which her bf cannot match!
yes this is really awkward and really bad of your friend to do such thing but apart from that, on the subject of age difference, I dont see anything wrong with old cow and young grass as long as he can fuck and she enjoy the fuck, all's well that end well