There are some universal truths when it comes to those pesky grey hairs. They show up when you least expect it and they arrive much quicker than you were anticipating. Some Valet. staffers spotted their first greys in their mid-20s while others in their 40s have yet to sprout one. Those damn grey hairs don't play fair. The first thing to remember is that this is not a sign of your youth fading. “There are two main factors that cause grey hair: the decrease in melanogenesis and the increase in oxidative stress in the hair bulb,” says celebrity hairstylist Jay Small, who's become something of an expert in fighting greys. “We have found that beards are where most men identify their grey hair first—this is because the rate of growth in beards is so much faster than head hair.” If you've recently noticed more grey than you'd like to see, you have some options. Here is what the experts suggest.