When Maggie Jones’s marriage collapsed after 23 years, she was devastated and overwhelmed. She was in her 50s, with two jobs, two teenage daughters and one dog. She didn’t consider dating. She had no time, no emotional energy. But then a year passed. One daughter was off at college, the other increasingly independent. After several more months went by, she started to feel a sliver of curiosity about what kind of men were out there and how it would feel to date again. That meant online dating — the default mode not just for the young but also for people Ms. Jones’s age. Her only exposure had been watching her oldest daughter, home from college one summer, as she sat on her bed rapidly swiping through guy after guy — spending no more than a second or two on each. Ms. Jones tells her story of online dating in later adulthood, and what she learned.