I am 41, and have greying hair, but people think I am younger.
A while back, someone called me to help them out with a small project, because they had been told by their regular lawyer that I was "the expert."
When we met, the client contact was surprised by my appearance. You're not at all what I expected, the contact said, I thought you were about 60.
Perhaps they were expecting "the expert" to look more like this.