I have long believed in the therapeutic effect of colouring in for adults of any age. I loved colouring in with my grandchildren, when they were little - not just to please them, although they loved Granny to join in, but for the pleasure and relaxation I found myself enjoying in the process.
I found this very good website, "Golden Carers", which not only discusses the benefits of colouring in for the elderly, but also includes five downloadable drawings. They can then be printed as needed.
Here is the link....
Benefits of Colouring in for the Elderly