I'm certainly no expert on this but according to NWTF's TurkeyCall magazine May/June 2001 issue, Rob Keck says,

1 yr = 1/2" or less
2 yrs = 1/2" to 7/8"
3 yrs = 7/8" to 1"
4+ yrs = 1" +

Jakes grow 1/2" or shorter spurs their first year. Two-year-old toms sport blunt spurs less than 7/8". By age 3, spurs become sharp, unless worn down by rocky terrain. The Merriam's and Gould's subspecies tend to have shorter than average spurs. Gobblers living in areas with sandy soil tend to sport the longest spurs.

That's what it says, I have no evidence to back it up. Just passing it on.


Romans 8:28