They came to this land with the Mother and her people, age upon age long gone.

Thus, reading comprehension is dependent upon the quality of literary exposure, not upon age.

The manipular army was based upon social class, age and military experience.

The upper threshold of a normal human resting heart rate is based upon age.

Because the data comes from a survey conducted at one point in time, we cannot tell if the relationship is conditional upon age or period, however.

The type of anesthesia used depends upon the procedure and the person's health, age, and preferences.

Calyx size is largely dependent upon age and maturity.

The tree grows rapidly when young though the growth rate slows to medium upon middle age and maturity.

Therefore the association made, in 2007, divisions in the class based upon age of the boat: