Found this interesting thread and decided to make my first post here...
I have been using make-up for about 3 years now. I use Igia instant cover ("as seen on TV") to cover up scarring and pimples. I'm over 30 and STILL have acne occasionally.
If you count Clearasil cover-stick as "make-up", well then I've been using "make-up" since I was about 13 years old... (Damn hormones...)
If I wasn't using Igia, then I would still be using Clearasil for the same purpose. So I have no moral problems using Igia. Of course I use it a bit more "liberally" than Clearasil... Not all over my face, but around my nose, under the eyes, and that general area.
If you overuse it (in thickness), then it can be noticed. But if you use just a little, I doubt nobody notices. Less is more, and usually enough... Igia bottle (2 oz) is VERY long-lasting. I use it almost every day and one bottle is good for two years!
By the way, I have also tried hair-pieces (don't wear one currently), hair loss concealers (those I still use) and I also wear contact lenses... So I'm pretty much a "fake" guy all over.

What you see is definitely NOT what you get...
But who cares. I'm over 30 and I need young pussy, and I'm willing to do whatever reasonable to get it. So far I've been fairly successful and I look somewhat younger than I really am. (The "natural me" looks at least as old as my real age, if not older. And definitely UGLY.)
And most chicks aren't exactly "natural" either.