This pattern can be seen in older specimens up to 17 years of age, and above.

Older specimen would probably have too few C14 left in them to give us accurate estimates.

Older specimens usually have no hairs, as they are rubbed off with time.

It would mean too that the breeding period of older specimens was extended.

This is more pronounced and less pleasant in older specimens.

The oldest specimens were found 80 miles northeast of Phoenix.

In both locales, there are a considerable number of young and old specimens.

Judging from the gray around the eyes, ears, and mouth, this was an older specimen.

It is rounded above and flaring in old specimens below.

Despite these differences, older specimens can be difficult to distinguish from Geastrum in the field.