I'm 42, and probably could pass for older due to the grey hair. Son says when I get a close crop hair cut that I look early 30's, but I'm fairly muscular...weight about 230ish and hair some fat because I'm not trying to look ripped/cut.

I can out lift and out work most everyone in the gym. Sometimes the "kids" come and watch me!

I agree that working out, staying fit, and having between 12-18% body fat is about the best way to stay looking younger. I just have bad genetics and will be totally grey in the next 5 years.