Hey Billygoat,
Nice roots - those long necks are special for sure.
I found several in the 20-25 year old range this year and one in the 35 year old range.
Here is a pic of it - it had a extra long neck. If you count back that root got it's start around 1975. To me it is kind of bitter sweet digging one like that.
I also found one with double 3 prong tops not long ago and planted the root in my seed producing bed.
TNhunter