Watery eyes can be due to many factors and conditions. In older adults, persistent watery eyes may occur as the aging skin of the eyelids sags away from the eyeball, allowing tears to accumulate and flow out. Sometimes, excess tear production may cause watery eyes as well. Allergies or viral infections (conjunctivitis), as well as any kind of inflammation, may cause watery eyes for a few days or so. If the signs persist, go to an ophthalmologist.