For the past eighteen months I've seen a guy in passing when we're out walking our dogs. He always beams a smile and keeps prolonged eye contact as we're approaching. We usually stop and chat. Once or twice we walked along together and the dogs have played. Sometimes what I assume is his wife/gf will be with him. He still beams and looks at me but won't then walk along with me. She seems chilled and will also say a few general words about the dog/weather, etc, when we stop.
He's probably about 15 to 20 years older than me.
I got the feeling when I first saw him when he was alone that he was interested in me. After I saw him with her, I'm not so sure what's going on. He always looks pleased to see me whether she's with him or not.