DEAR ABBY: I’m a 64-year-old guy. I am single and have two daughters and four grandkids. A young woman (“Sarah”), who is my daughter’s age, and I have been hiking buddies for the past five years. I treat her like my third daughter and a family member. Sarah is married, and her husband does not enjoy hiking. Her husband and my daughters accept our friendship and are happy that I found a person I can hike with.I have been dating a lady (“Toni”) who is close to my age. Six months ago, I suggested we should spend our lives together....