Probably 20 years ago, my niece (brother's duaghter) was attending a college about 90 minutes away from where I lived at the time. I had occasion once to drive to a client in her college town. So, I called her up and offered to take her to dinner. She wanted to go to one of her (and her friends') favorite watering holes. I was early 40s and she was maybe 20. She was an attractive girl-next-door back then and she's a very attrractive 39-year old today.
There was no issue from my perspective. But, I thought later about her friends who may have seen her there with a much older guy who wasn't her dad.