I think he stopped me, because I'm currently wearing a beard that makes me look a bit older. My wife is in Europe for 2 1/2 months as a traveling nanny for my daughter and son-in-law who are abroad doing historical research and who will be presenting papers at two conferences in Switzerland in July. My beard is my "bachelor beard" :)
Yesterday, I was running, and two older men passed me on their bikes. One of them shouted out, "Keep it up, youngster!" This morning I passed a walker, and she said, "You're awesome".
Before I grew my beard, I never received comments like these, so I like that the beard makes me look older and thus more of a "miracle runner" in the eyes of the runners who comment to me.
Here are my before and after pictures.