https://psychology-tools.com/test/geriatric-depression-scale
The Geriatric Depression Scale (GDS) is a simple, 30-item, yes/no questionnaire that can be helpful in identifying possible depression among elderly people. I found the questions that the questionnaire asks quite intriguing. Take a look!
It's also worth comparing the Geriatric Depression Scale to the Adolescent Depression Scale, both of which come from the same source: https://psychology-tools.com/test/kutcher-adolescent-depression-scale