I look about a decade younger than I am. The way it has affected me most is typically during job interviews where the interpretation of my age compared to my job history raises questions. We typically have a good laugh about it too. I mean imagine looking at a guy with a degree and a solid decade of experience in the field and he looks like he's in late twenties. The math just isn't there so I totally get it and the moment I see a certain look I tell them I'm not as young as I look. I have been asked to see an ID a couple of times after being told that I was mostly likely hired and typically get something like a "well someone won the genetic lottery" comment.