Mike Severo It's so cool that you read my comment lol, cool song. Nice 'staches, guys...I'm growing one myself (I'm a guy, ignore the profile pic haha)
It takes a little longer for the moustache. Started at 19 and kept it up till 21. The filling in at least for me happened all at once and for two years it was just an outline.
I had a full beard and just an outline of a mustache until like 24, then only a small mustache until it thickened up at 28. Be glad lol. Id rather have a thick stache and patchy beard than a thick beard with a patchy stache.