In elderly subjects (60 - 75 years) however, caffeine improved performance during more complex tasks requiring sustained attention. (coffeeandhealth.org)
It implies that the cold airflow may have a greater impact on the overall sleep of female and elderly subjects with lower physical strength or a greater sensitivity to cold. (sciencedaily.com)
In many studies, young and elderly subjects appear to respond to the effects of caffeine differently. (coffeeandhealth.org)