In my area of PA, two year olds are usually about 3/4-7/8" and still blunt. A three year old is right about 1" or 1 1/8" and sharp. A four year old is a tad longer and starting to hook a bit...after that it's anyone's guess. Lovett E williams says that a beard grows about 5" a year, but after 10" on average the end starts to wear as they step on it alot when scratching and feeding, etc...also heard many old timers blame it on ice in the beard breaking the tip off, even hens pecking at it in a display of dominance...sorta trying to knock him down a couple rungs. My wife could relate to that! LOL Beard aging is basically useless beyond two years.