An elderly guy in his 80s has been taking part in a longitudinal study of aging. He doesn't have any serious medical issues. In order to track long-term changes in pulmonary gas exchange, arterial blood gas samples are taken once every ten years on room air at sea level. Which of the following outcomes is most consistent with normal aging as compared to 30 years ago? 
Definitions:
Catatonic Schizophrenia
A subtype of schizophrenia characterized by abnormalities in motor behavior, which can range from physical immobility to excessive motor activity.
Motor Behavior
The study of how motor skills are learned, controlled, and developed to enable voluntary movements.
Disturbance
An interruption of peace, order, or normal functioning; often referring to an environmental or ecological disruption.
Vulnerable to Stress
Describes individuals or organisms that are more likely to experience negative outcomes or harm as a result of stressful situations or environments.
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