Dr. Ree Saycher is interested in conducting a study on the process of aging. What are three different markers of age that Dr. Ree Saycher may use to study this process?
A. Present morbidity; life extension; compression of morbidity
B. Chronological age; functional age; subjective age
C. Oldest-old; old-old; young-old
D. White hair; wrinkles; glasses