Depression is very common in old age. Because it is associated with many issues related to aging such as having diabetes, hypertension, and other diseases and also the general ability to do less than when a person was younger, it is often assumed that depression is just part of the aging process. Inadequate treatment is often given for depression, frustrating patients and clinicians. However, aggressive depression treatment in elderly individuals can be very successful and greatly improve an older person’s quality of life.

PHQ-9

USPSTF recs

JAMA Patient Page on Screening for Depression