I've been told I don't look like I'm 66. The latest guy to tell me that was the worker at Social Security, where I was setting up to draw on benefits. In fact he was impressed that I not only biked the 5 miles there, but when I had to retrieve an original document from home, went and got it and was back within the hour (10 miles).
It could be that ppl are more health conscious than in the past. Also, style does a lot to date someone. Altho my style of T-shirt and cutoff denim jeans sort of dates me, it was the attire of young ppl back in the day.