I must be doing not too bad...
I have a Ecodrive watch that has a serial number in really really fineprint under the "VI" (the roman numeral 6) and when my wife and i got it about 5 years ago, i read the serial number to the jeweler. He responded "there's no way, you can read that!" and pulled out a jeweler magnifying glass and read the same number I just gave him.
Every once in awhile, i keep checking that serial number to make sure I can still read it. not bad for being in my 30's