Final answer:
Presbyopia is the most likely reason why Paul is unable to read the fine print on his aspirin bottle.
Step-by-step explanation:
The most likely reason that Paul is unable to read the fine print on his aspirin bottle is due to presbyopia. Presbyopia is a common vision problem associated with aging, in which the eye gradually loses its ability to focus on close objects.
As people age, the lens in their eyes becomes less elastic and the muscles that control the lens lose power. This leads to difficulty in focusing on small objects and fine print.