All age determinations have been normalized to -25 in accordance with international convention.

Old families are thought to contain few small members, and this is the basis of the age determinations.

The arithmetic mean of the age determinations is:

Gyrochronology, or the age determination of a star based on its rotation and color, results in an average age of 2.0 0.2 Gyr.

The age determination of the iodine indicated multiple methane sources.

As well as allowing a more accurate age determination, finding such evidence would also strengthen the impact hypothesis.

Summary of age determinations carried out during the period April 1982 to March 1983.

This use sometimes creates conflicting age indicators (for example, red hair belonging to a wrinkled face), making age determination difficult.

This, however, is only a small part of the uncertainty of the final age determination (see section Calibration below).

Examination of his teeth indicated he died around age 35, but this method of age determination is now believed to be inaccurate for older animals.