Bro, I was in the same position last night, as I saw some folks I hadn't seen since high school (I'm 24). A couple of things: objectively, how noticeable is your thinning? Chances are, it looks much worse to you than to others. Number 2: Toppik or a hat. People who are NW0's rock them. 3.) Reread Yetti's quote. Until I started thinning, I had no idea about the symptoms of male pattern baldness. Only the trained eye can detect it, and those of us gain the trained eye by suffering from it ourselves
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One other thing: do not, I repeat do not, fixate on it before you leave. Maybe avoid harsh lighting the day of your meeting. Style as best you can to get coverage and don't give it a second thought