Speed dating is a formalized matchmaking process of dating system whose purpose is to encourage people to meet a large number of new people.
Its origins are credited to Rabbi Yaacov Deyo of Aish Ha Torah, originally as a way to help Jewish singles meet and marry.
Carbon dating has a certain margin of error, usually depending on the age and material of the sample used.
Carbon-14 has a half-life of about 5730 years, and therefore it is used to date biological samples up to about 60,000 years in the past.
The nutrimental input from the tree's surroundings to sustain constant ring growth thickness cannot be supported, and so the ring growth thickness diminishes proportionally.
The change from the thin wall to the thick wall tracheid can be very rapid as in Douglas fir, or more gradual as in Scots pine.
Other softwoods such as the firs, spruces etc., display growth rings which are not so distinct, because the summer wood is pale.
Thus the term 'old' when applied to trees does not infer senility!
These Tracheids are thick walled and provide rigidity and stability to the bole.