I like portraits of old people. There is always so much character in their faces. I like the expression here, nice pose.
Here are a couple of things I would suggest:
• Use some side lighting to add depth. If you don't have lights, use a window. Then use your shutter speed to control the strength of the available light.
• Have your subject stand farther from the background and select a larger aperture. This will create a more narrow depth of field and "blur out" distracting background elements like wrinkles/folds in your backdrop.