Maya,
They changed our opening from Aug 15 to Sept 1 here in TN last year and I think that was a good call for us.
Aug 15 many still have green berries, but by Sept 1 most are red.
There is no age requirement here in TN though... has to be a 3 prong, but no age specified.
I have found roots though that did not look to be 10 years old (based on root neck) but were on nice size 3 and 4 prongers and had 1.0-1.5 oz roots.
In the image below the 4 smallish roots (top right) were all in the 20+ age range... They were found in deep shade in regular wood on a north facing hillside.
The much larger roots (with short root necks) were found on a east facing bluff where they were getting a lot of morning sun, and growing in soil that was probably loaded with calcium (rock chip filled stuff). They all looked to be quite young to me.
They were legal to dig here, but if you had a 10 year age rule - guess you would have had to plant those back ?
That would be tough - No ?
PS - hope you do get well enough to get out and dig some this year.
TNhunter