The GDS is a screening tool to facilitate the assessment of depression in older adults. It is available in both long form and short form versions and also in multiple languages.
Reference: Yesavage, J. A., Brink, T. L., Rose, T. L., Lum, O., Huang, V., Adey, M., & Leirer, V. O. (1983). Development and validation of a geriatric depression screening scale: A preliminary report. Journal of Psychiatric Research, 17(1), 37–49. Retrieved from https://web.stanford.edu/~yesavage/GDS.html