Just be sure to avoid the ents, they are quite defensive about their age and may raise their voice by a decibel
If you don't know when it was planted, then just cut the tree down and count the rings. Easy!
I think one human year equals 7 tree years, or something. So if you know when the tree was planted, just multiply by 7!
Assuming you live in a region with 4 seasons per year, then yeah.
From what I understand (and according to this), the lighter parts of the rings get created when the tree grows rapidly, which typically happens in spring. And the darker parts get created during slower growth, which typically happens in summer. In autumn and winter, trees tend to not grow.
This does have real implications in dendrochronology. If you were to take a beam from a structure built hundreds or even thousands of years ago, you can use ring spacing along with climate records of the area it was cut down in to determine when it was cut down, which will tell you the approximate age of the structure (and as a result, the tree). The rings can reflect events such as floods, fires, droughts, and periods of rapid growth, so if you can match those up with climate records and known samples, it works out the way the graphic describes.
The text at the bottom suggests that you can also use the trees planting year to determine its age. Which is also true
Oh i dunno, basic math seems to elude so many i wouldnt count on them knowing how old a tree is by having the date it was planted
if you planted from seed, some trees from the nursery may be 8 years old or older, specially those that come rooted in 45 gallon containers
The great thing about this test is that this age value will remain constant after taking the measurements.