i'd say wait until your early 20's before trying, not many guys can really grow it before then, I also found that it wasn't until about 26 that my 'tasch would bridge the gap between my mouth and my chin, but its there now, and a fine beard I do sport!
---------- Post added 2012-11-19 at 10:31 AM ----------
thats quite a claim for me to live up to =/