2018 Median Age of Marriage

So my Dad around his early 80's after outliving my mother and then his girlfriend(he died last year at 95) told once about a movie he saw about an older man dating a younger woman trying get my opinion . I shrugged it off saying its not a big deal. Two days later my sister sees him in a grocery store parking lot with a women half his age, younger than my sister. She goes up to talk to him and the woman who didn't know my sister starts giving her dirty looks. Anyway she calls me up and tells me she thinks our Dad has another family and describes the woman (in her 40's pretty Blonde with blue eyes) thinking dad has another daughter. I say no it his girlfriend and told my sister about the previous conversation with Dad. I think he was testing the waters seeing if we would disapprove before he would tell us. This woman followed my Dad around like a puppy dog for years. It was kind of awkward at times I would call him and it was obvious he was in Bed with the woman and on occasion I would pop by and he would come out of the bedroom and she was still in his bed. She did not live with him my Dad was a Smart no commitments, a Stud. She did not get anything when he died.