It would be possible to find the age of a tree using radiocarbon dating.
One of the most frequent uses of radiocarbon dating is to estimate the age of organic remains from archaeological sites.
Therefore, by dating a sample of wood from the INNER ring of the tree you could find out when it first began to grow.
carbon dating, is a radiometric dating method that uses the naturally occurring radioisotope carbon-14 (14C) to determine the age of carbonaceous materials up to about 58,000 to 62,000 years. Raw, i.e.
uncalibrated, radiocarbon ages are usually reported in radiocarbon years "Before Present" (BP), "Present" being defined as AD 1950.
Emilio Segrè asserted in his autobiography that Enrico Fermi suggested the concept to Libby in a seminar at Chicago that year.
Libby estimated that the steady state radioactivity concentration of exchangeable carbon-14 would be about 14 disintegrations per minute (dpm) per gram.